• Re: Canon ImageCLASS Color Lasers won't print

    From Nuno Silva@nunojsilva@invalid.invalid to alt.comp.periphs.printers,comp.periphs.printers on Sat Dec 13 10:06:19 2025
    From Newsgroup: comp.periphs.printers


    On 2025-12-09, Lars Poulsen wrote:

    My shop had a Canon color laser printer that has been working well for a decade, but after half our PCs had upgraded to Windows-11, it became intermittently unable to print: For some PCs, Windows would claim that
    the printer was offline. Sometimes it would work agin after power
    cycling the printer. It seemed clear that this was a software/driver
    problem. After trying everything I could think of for a couple of
    weeks, I decided that I needed Canon helpdesk support, but I had no hope
    of getting them to invest energy in an old, discontinued model, so I
    went and bought a new model as similar as possible to the old one. In
    fact, it looks identical, but the tomer cartridges have a different
    number :-(

    That was a month ago, but despite several hour-long support calls, the
    new printer has the same kind of problems, except it fails more
    reliably, and power cycling does not seem to help any more.
    When I call tech support, their scripts eventually get it working after
    an hour-long session. I print a few files, and say goodbye to the
    helper. And the next day, the problem is back.

    For a week, we went through a loop, where "making it work" included
    having the printer get a random IP address from DHCP. Then I edited the
    DCHP server configuration to put the printer on the IP address that we
    have allocated for it in DNS, and then it would stop working.
    Eventually, I picked a new "permanent" address for it and aligned the
    DHCP and DNS addresses to that IP. And it worked for a week ...

    In the old days, one could define it as a "generic postscript printer"
    and load a proper PPD file, but I can't seem to find a PPD file for the current Canon printers.

    My current working hypothesis, is that the faily recent drivers
    fail to relese the TCP session at the end of printing, thus preventing
    the next user from connecting from another device. It might even be on
    the printer side.

    Should I just take this printer back to BestBuy for a refund?
    And if so, what is a better printer for my environment?

    I need to use this with:
    - permanently installed Windows-11 desktops
    - ambulant Windows-11 laptops
    - a Linux server running CUPS
    - a couple of old desktops in a lab running Windows-7
    - and if possible, AirPrint from a few iPhones (old one did not do
    that)

    So it's failing for all systems, despite having been triggered by the
    Windows 11 update?

    Is it feasible to try to use it without Windows 11 just to see if the
    problem re-appears?

    Can any of the other systems be used as a printer server 24/7 (or at
    least when needed) to avoid printing directly from Windows 11?

    It is a sad fact, that there seem to be no good printers anymore,
    with the possible exception of monochrome lasers.

    I know that for anyone to actually help, I need to give model
    numbers, driver versions etc, but I am posting this from home,
    and that info is at the office. I will add that in a follow-up if
    anyone here thinks they have ideas that require it. Right now I am
    hoping to hear from anyone that has experience with these printers,
    good or bad.

    (I don't have any pointers, sorry, I'm just coming up with some
    questions to try to understand the mystery.)

    Another one: does the Windows 11 Canon driver have any configuration
    options?
    --
    Nuno Silva
    --- Synchronet 3.21a-Linux NewsLink 1.2
  • From Lars Poulsen@lars@beagle-ears.com to alt.comp.periphs.printers,comp.periphs.printers on Sun Dec 14 03:40:58 2025
    From Newsgroup: comp.periphs.printers

    On 2025-12-09, Lars Poulsen wrote:
    My shop had a Canon color laser printer that has been working well for a LP>> decade, but after half our PCs had upgraded to Windows-11, it became
    intermittently unable to print: For some PCs, Windows would claim that LP>> the printer was offline. Sometimes it would work agin after power
    cycling the printer. It seemed clear that this was a software/driver
    problem. After trying everything I could think of for a couple of
    weeks, I decided that I needed Canon helpdesk support, but I had no hope LP>> of getting them to invest energy in an old, discontinued model, so I
    went and bought a new model as similar as possible to the old one. In
    fact, it looks identical, but the tomer cartridges have a different
    number :-(

    That was a month ago, but despite several hour-long support calls, the LP>> new printer has the same kind of problems, except it fails more
    reliably, and power cycling does not seem to help any more.
    When I call tech support, their scripts eventually get it working after LP>> an hour-long session. I print a few files, and say goodbye to the
    helper. And the next day, the problem is back.

    For a week, we went through a loop, where "making it work" included
    having the printer get a random IP address from DHCP. Then I edited the LP>> DCHP server configuration to put the printer on the IP address that we LP>> have allocated for it in DNS, and then it would stop working.
    Eventually, I picked a new "permanent" address for it and aligned the
    DHCP and DNS addresses to that IP. And it worked for a week ...

    In the old days, one could define it as a "generic postscript printer" LP>> and load a proper PPD file, but I can't seem to find a PPD file for the LP>> current Canon printers.

    My current working hypothesis, is that the faily recent drivers
    fail to relese the TCP session at the end of printing, thus preventing LP>> the next user from connecting from another device. It might even be on LP>> the printer side.

    Should I just take this printer back to BestBuy for a refund?
    And if so, what is a better printer for my environment?

    I need to use this with:
    - permanently installed Windows-11 desktops
    - ambulant Windows-11 laptops
    - a Linux server running CUPS
    - a couple of old desktops in a lab running Windows-7
    - and if possible, AirPrint from a few iPhones (old one did not do
    that)

    On 2025-12-13, Nuno Silva <nunojsilva@invalid.invalid> wrote:
    So it's failing for all systems, despite having been triggered by the Windows 11 update?

    Is it feasible to try to use it without Windows 11 just to see if the problem re-appears?

    You ask a set of very good questions.

    Troubleshooting is very much complicated by the intermittent qualities
    of the problems. But each of the clients has issues that are mystifying.

    If the problem is client-side, you would expect that some client that
    shares no code with the others would behave better. For this, I have
    been experimenting with the iPhone clients: iOS AirPrint and Canon Print
    for iPhone. When I tried that yesterday, the iOS "share" function did
    not work: It lets me select the printer, then seemingly accepts the
    printout, but nothing prints, and when I try again, the Canon is no
    longer a selectable printer. But the Canon Print app works.

    The Windows and Linux dvers have the same name, so they may have some
    code shared.

    Can any of the other systems be used as a printer server 24/7 (or at
    least when needed) to avoid printing directly from Windows 11?

    That is why the Linux system is in the mix. If it worked reliably, I
    would have everybody else go through it. But it flakes out similarly to
    the Windows systems. And Canon explicitly disclaims support for the
    Linux driver, which is supplied "as a courtesy", but cannot be supported
    due to the great variety of Linux distributions.

    It is a sad fact, that there seem to be no good printers anymore,
    with the possible exception of monochrome lasers.

    I know that for anyone to actually help, I need to give model
    numbers, driver versions etc, but I am posting this from home,
    and that info is at the office. I will add that in a follow-up if
    anyone here thinks they have ideas that require it. Right now I am
    hoping to hear from anyone that has experience with these printers,
    good or bad.

    (I don't have any pointers, sorry, I'm just coming up with some
    questions to try to understand the mystery.)

    Another one: does the Windows 11 Canon driver have any configuration options?

    Not that I have found. You run the self-extracting install-kit, then
    configure it with "Add Printer". Choice of letting Windows search for
    it and auto configure it, or manually set it up as "IPP", "HTTP" or use
    a designated TCP port. I have tried most variations there, but MS's
    attempts to make it user friendly makes it hard to figure out what goes
    wrong, when the setup times out, either in querying the printer for
    information or when sending a test page.
    --
    Lars Poulsen - an old geek in Santa Barbara, California
    --- Synchronet 3.21a-Linux NewsLink 1.2
  • From Nuno Silva@nunojsilva@invalid.invalid to alt.comp.periphs.printers,comp.periphs.printers on Sun Dec 14 11:22:14 2025
    From Newsgroup: comp.periphs.printers

    On 2025-12-14, Lars Poulsen wrote:

    On 2025-12-13, Nuno Silva <nunojsilva@invalid.invalid> wrote:
    So it's failing for all systems, despite having been triggered by the Windows 11 update?

    Is it feasible to try to use it without Windows 11 just to see if the problem re-appears?

    You ask a set of very good questions.

    Troubleshooting is very much complicated by the intermittent qualities
    of the problems. But each of the clients has issues that are mystifying.

    If the problem is client-side, you would expect that some client that
    shares no code with the others would behave better. For this, I have
    been experimenting with the iPhone clients: iOS AirPrint and Canon Print
    for iPhone. When I tried that yesterday, the iOS "share" function did
    not work: It lets me select the printer, then seemingly accepts the
    printout, but nothing prints, and when I try again, the Canon is no
    longer a selectable printer. But the Canon Print app works.

    To make matters more complicated, there's always the chance one driver
    is confusing the device to the extent another driver cannot use it.

    Also, I suppose it's always possible this is caused by something in the
    driver that interacts with the printer even when it's not printing
    (e.g. some status query?), and so it's always possible such a Windows 11
    system with the printer configured, but not in use, is enough to confuse
    the printer.

    (The joys of troubleshooting!)

    The Windows and Linux dvers have the same name, so they may have some
    code shared.

    Can any of the other systems be used as a printer server 24/7 (or at least when needed) to avoid printing directly from Windows 11?

    That is why the Linux system is in the mix. If it worked reliably, I
    would have everybody else go through it. But it flakes out similarly to
    the Windows systems. And Canon explicitly disclaims support for the
    Linux driver, which is supplied "as a courtesy", but cannot be supported
    due to the great variety of Linux distributions.

    They're just making excuses. The same could be said of Windows, for
    example, at least as soon as you venture out of making just a driver,
    and start adding tools around it?

    Was the Linux driver also updated meanwhile, or it used to work before
    with no related software change in between?

    As much as I'd prefer Ethernet with 8P8C (or perhaps Wireless LAN as a fallback) as opposed to a connection to a computer, does the printer
    have that as an option you can use with the Linux system, connecting it directly to that computer over e.g. USB?

    That way, it'd perhaps allow testing in a scenario where it'd be harder
    for other drivers to confuse the printer. (On top of that, for this you
    may want to temporarily try a Postscript driver when printing via IPP to
    CUPS from Windows, just in case there's also something in the generated
    printer content from the driver that is causing trouble.)

    Another one: does the Windows 11 Canon driver have any configuration options?

    Not that I have found. You run the self-extracting install-kit, then configure it with "Add Printer". Choice of letting Windows search for
    it and auto configure it, or manually set it up as "IPP", "HTTP" or use
    a designated TCP port. I have tried most variations there, but MS's
    attempts to make it user friendly makes it hard to figure out what goes wrong, when the setup times out, either in querying the printer for information or when sending a test page.

    I'm thinking of stuff that'd be available both in printer settings (for defaults) and in advanced settings when printing.

    For example, "MS Publisher Color Printer" (available at least in NT
    6.1), one of the Postscript drivers available with Windows, has a small
    number of Postscript options in the advanced settings.

    See [1] for screenshots of this, albeit these seem to be for a HP
    Laserjet driver. (Also, the first screenshot in that section shows
    another place where there might be settings?)

    [1] http://pig.made-it.com/printing.html#4936

    No idea whether the Canon driver has anything like this, but it's worth checking it out, in case there's some option that could improve
    compatibility.
    --
    Nuno Silva
    --- Synchronet 3.21a-Linux NewsLink 1.2
  • From Lars Poulsen@lars@beagle-ears.com to alt.comp.periphs.printers,comp.periphs.printers on Sun Dec 14 13:46:56 2025
    From Newsgroup: comp.periphs.printers

    I'm trying to keep attributions straight, but without a script to do it,
    I am nearing my limit.

    On 2025-12-13, Nuno Silva <nunojsilva@invalid.invalid> wrote:
    So it's failing for all systems, despite having been triggered by the
    Windows 11 update?

    Is it feasible to try to use it without Windows 11 just to see if the
    problem re-appears?

    On 2025-12-14, Lars Poulsen wrote:
    You ask a set of very good questions.
    Troubleshooting is very much complicated by the intermittent qualities LP>> of the problems. But each of the clients has issues that are mystifying. LP>>
    If the problem is client-side, you would expect that some client that
    shares no code with the others would behave better. For this, I have
    been experimenting with the iPhone clients: iOS AirPrint and Canon Print LP>> for iPhone. When I tried that yesterday, the iOS "share" function did
    not work: It lets me select the printer, then seemingly accepts the
    printout, but nothing prints, and when I try again, the Canon is no
    longer a selectable printer. But the Canon Print app works.

    On 2025-12-14, Nuno Silva <nunojsilva@invalid.invalid> wrote:
    To make matters more complicated, there's always the chance one driver
    is confusing the device to the extent another driver cannot use it.

    For a while, my hypothesis was that the driver did not clear the
    connection at the end of the print job. With a single-threaded
    file-receive process in the printer, that would give almost these
    results. But that is too simple an explanation, and if that were so, powercycling the printer should clear it. It does not - reliably clear
    it.

    Also, I suppose it's always possible this is caused by something in the driver that interacts with the printer even when it's not printing
    (e.g. some status query?), and so it's always possible such a Windows 11 system with the printer configured, but not in use, is enough to confuse the printer.

    (The joys of troubleshooting!)

    The Windows and Linux dvers have the same name, so they may have some
    code shared.

    Can any of the other systems be used as a printer server 24/7 (or at
    least when needed) to avoid printing directly from Windows 11?

    That is why the Linux system is in the mix. If it worked reliably, I
    would have everybody else go through it. But it flakes out similarly to LP>> the Windows systems. And Canon explicitly disclaims support for the
    Linux driver, which is supplied "as a courtesy", but cannot be supported LP>> due to the great variety of Linux distributions.

    They're just making excuses. The same could be said of Windows, for example, at least as soon as you venture out of making just a driver,
    and start adding tools around it?

    Was the Linux driver also updated meanwhile, or it used to work before
    with no related software change in between?

    The Linux driver used to be quite reliable, but starting about a year
    ago it became flaky, and I just told my users to use the direct spooler
    on their Windows and Mac systems. So that may have been when the current
    Linux driver came in with a Fedora version upgrade.

    As much as I'd prefer Ethernet with 8P8C (or perhaps Wireless LAN as a fallback) as opposed to a connection to a computer, does the printer
    have that as an option you can use with the Linux system, connecting it directly to that computer over e.g. USB?

    The printer can connect via USB, Ethernet or WiFi, but only one at a
    time. (Unlike my Epson inkjet at home.) And the Linux server system is
    at the opposite end of our office suite. And iOS AirPrint does not work
    if the printer is not using WiFi.

    That way, it'd perhaps allow testing in a scenario where it'd be harder
    for other drivers to confuse the printer. (On top of that, for this you
    may want to temporarily try a Postscript driver when printing via IPP to CUPS from Windows, just in case there's also something in the generated printer content from the driver that is causing trouble.)

    That is a good suggestion, but a PosstScript driver needs a PPD
    (PostScript Printer Definition) file for the printer, and I can't find
    one for the newer Canon printers.

    Another one: does the Windows 11 Canon driver have any configuration
    options?

    Not that I have found. You run the self-extracting install-kit, then
    configure it with "Add Printer". Choice of letting Windows search for
    it and auto configure it, or manually set it up as "IPP", "HTTP" or use LP>> a designated TCP port. I have tried most variations there, but MS's
    attempts to make it user friendly makes it hard to figure out what goes LP>> wrong, when the setup times out, either in querying the printer for
    information or when sending a test page.

    I'm thinking of stuff that'd be available both in printer settings (for defaults) and in advanced settings when printing.

    For example, "MS Publisher Color Printer" (available at least in NT
    6.1), one of the Postscript drivers available with Windows, has a small number of Postscript options in the advanced settings.

    See [1] for screenshots of this, albeit these seem to be for a HP
    Laserjet driver. (Also, the first screenshot in that section shows
    another place where there might be settings?)

    [1] http://pig.made-it.com/printing.html#4936

    Yes there used to be a "Generic Color PS Printer" available for Windows
    in both the HP and MicroSoft section of Windows printer installation,
    but I do not see them anymore.

    No idea whether the Canon driver has anything like this, but it's worth checking it out, in case there's some option that could improve compatibility.

    That is why I was exloring the idea of a non-Canon Postscript driver.

    I have until the end of January to return the printer to BestBuy.
    I am still hoping that I am overlooking something obvious because
    of my feeling of panic.

    The alternative is to get a different brand of printer in the
    same class - rated for 4000 pages per month. I am trying to stick with
    Canon beacuse of a proven solid mechanical build quality (very few paper
    jams).
    I have been turned off by HP's forced subscription options, and swore
    that I would never buy another one.
    There is an Epson in a similar range (albeit a couple hundred dollars
    more), but user reviews are very mixed.

    What else is there? I have heard very good things about Kyocera's
    high-end systems, but I have never seen their mid-range units in
    the wild. Ricoh used to be OK, but I have not seen them in years.

    There is a Xerox C325, but I also do not see that in stores.
    --
    Lars Poulsen - an old geek in Santa Barbara, California
    --- Synchronet 3.21a-Linux NewsLink 1.2
  • From Nuno Silva@nunojsilva@invalid.invalid to alt.comp.periphs.printers,comp.periphs.printers on Mon Dec 15 01:00:26 2025
    From Newsgroup: comp.periphs.printers

    On 2025-12-14, Lars Poulsen wrote:

    I'm trying to keep attributions straight, but without a script to do it,
    I am nearing my limit.

    I've been in the habit of trying to trim down, but then I'll start
    leaving as-is in this thread, in case it helps you with that.

    (Also, when I first replied, I tried to reply to both your posts on both newsgroups. Sadly, some idiot (me) overlooked the fact that the
    References: header is *not* comma-separated, that there should only have
    been blanks in between the values. So that's why it didn't thread
    properly in both groups.)


    On 2025-12-13, Nuno Silva <nunojsilva@invalid.invalid> wrote:
    So it's failing for all systems, despite having been triggered by the >>> NS> Windows 11 update?

    Is it feasible to try to use it without Windows 11 just to see if the >>> NS> problem re-appears?

    On 2025-12-14, Lars Poulsen wrote:
    You ask a set of very good questions.
    Troubleshooting is very much complicated by the intermittent qualities LP>> of the problems. But each of the clients has issues that are mystifying. LP>>
    If the problem is client-side, you would expect that some client that LP>> shares no code with the others would behave better. For this, I have LP>> been experimenting with the iPhone clients: iOS AirPrint and Canon Print LP>> for iPhone. When I tried that yesterday, the iOS "share" function did LP>> not work: It lets me select the printer, then seemingly accepts the
    printout, but nothing prints, and when I try again, the Canon is no
    longer a selectable printer. But the Canon Print app works.

    On 2025-12-14, Nuno Silva <nunojsilva@invalid.invalid> wrote:
    To make matters more complicated, there's always the chance one driver
    is confusing the device to the extent another driver cannot use it.

    For a while, my hypothesis was that the driver did not clear the
    connection at the end of the print job. With a single-threaded
    file-receive process in the printer, that would give almost these
    results. But that is too simple an explanation, and if that were so, powercycling the printer should clear it. It does not - reliably clear
    it.

    Do these printers have a way to print directly from the printer from a
    USB flash drive or a memory card? If so, do they print normally when
    they're not usable through the network?

    Does the printer's own interface work normally when it's not usable
    through the network?


    Also, I suppose it's always possible this is caused by something in the driver that interacts with the printer even when it's not printing
    (e.g. some status query?), and so it's always possible such a Windows 11 system with the printer configured, but not in use, is enough to confuse the printer.

    (The joys of troubleshooting!)

    The Windows and Linux dvers have the same name, so they may have some LP>> code shared.

    Can any of the other systems be used as a printer server 24/7 (or at >>> NS> least when needed) to avoid printing directly from Windows 11?

    That is why the Linux system is in the mix. If it worked reliably, I LP>> would have everybody else go through it. But it flakes out similarly to LP>> the Windows systems. And Canon explicitly disclaims support for the
    Linux driver, which is supplied "as a courtesy", but cannot be supported LP>> due to the great variety of Linux distributions.

    They're just making excuses. The same could be said of Windows, for example, at least as soon as you venture out of making just a driver,
    and start adding tools around it?

    Was the Linux driver also updated meanwhile, or it used to work before with no related software change in between?

    The Linux driver used to be quite reliable, but starting about a year
    ago it became flaky, and I just told my users to use the direct spooler
    on their Windows and Mac systems. So that may have been when the current Linux driver came in with a Fedora version upgrade.

    As much as I'd prefer Ethernet with 8P8C (or perhaps Wireless LAN as a fallback) as opposed to a connection to a computer, does the printer
    have that as an option you can use with the Linux system, connecting it directly to that computer over e.g. USB?

    The printer can connect via USB, Ethernet or WiFi, but only one at a
    time. (Unlike my Epson inkjet at home.) And the Linux server system is
    at the opposite end of our office suite.

    Another idea: checking the network status on the printer itself (p103 of
    the PDF that was linked in another post). Is it the same as when it's
    working normally?

    And iOS AirPrint does not work
    if the printer is not using WiFi.

    Good job, Apple.

    That way, it'd perhaps allow testing in a scenario where it'd be harder for other drivers to confuse the printer. (On top of that, for this you may want to temporarily try a Postscript driver when printing via IPP to CUPS from Windows, just in case there's also something in the generated printer content from the driver that is causing trouble.)

    That is a good suggestion, but a PosstScript driver needs a PPD
    (PostScript Printer Definition) file for the printer, and I can't find
    one for the newer Canon printers.

    For the CUPS interfacing the printer, yes. But I think for others, which
    hand off to CUPS, that won't be necessary, or at least it should be
    usable without a PPD?

    Another one: does the Windows 11 Canon driver have any configuration >>> NS> options?

    Not that I have found. You run the self-extracting install-kit, then LP>> configure it with "Add Printer". Choice of letting Windows search for LP>> it and auto configure it, or manually set it up as "IPP", "HTTP" or use LP>> a designated TCP port. I have tried most variations there, but MS's
    attempts to make it user friendly makes it hard to figure out what goes LP>> wrong, when the setup times out, either in querying the printer for
    information or when sending a test page.

    I'm thinking of stuff that'd be available both in printer settings (for defaults) and in advanced settings when printing.

    For example, "MS Publisher Color Printer" (available at least in NT
    6.1), one of the Postscript drivers available with Windows, has a small number of Postscript options in the advanced settings.

    See [1] for screenshots of this, albeit these seem to be for a HP Laserjet driver. (Also, the first screenshot in that section shows another place where there might be settings?)

    [1] http://pig.made-it.com/printing.html#4936

    Yes there used to be a "Generic Color PS Printer" available for Windows
    in both the HP and MicroSoft section of Windows printer installation,
    but I do not see them anymore.

    No idea whether the Canon driver has anything like this, but it's worth checking it out, in case there's some option that could improve compatibility.

    That is why I was exloring the idea of a non-Canon Postscript driver.

    I have until the end of January to return the printer to BestBuy.
    I am still hoping that I am overlooking something obvious because
    of my feeling of panic.

    The alternative is to get a different brand of printer in the
    same class - rated for 4000 pages per month. I am trying to stick with
    Canon beacuse of a proven solid mechanical build quality (very few paper jams).
    I have been turned off by HP's forced subscription options, and swore
    that I would never buy another one.
    There is an Epson in a similar range (albeit a couple hundred dollars
    more), but user reviews are very mixed.

    What else is there? I have heard very good things about Kyocera's
    high-end systems, but I have never seen their mid-range units in
    the wild. Ricoh used to be OK, but I have not seen them in years.

    There is a Xerox C325, but I also do not see that in stores.
    --
    Nuno Silva
    --- Synchronet 3.21a-Linux NewsLink 1.2
  • From groenveld@groenveld@acm.org (John D Groenveld) to comp.periphs.printers on Mon Dec 15 14:21:44 2025
    From Newsgroup: comp.periphs.printers

    In article <10hnmjb$1gh7t$3@dont-email.me>,
    Nuno Silva <nunojsilva@invalid.invalid> wrote:
    And iOS AirPrint does not work
    if the printer is not using WiFi.

    Good job, Apple.

    mDNS likely not propagating across OP's wired and wireless LANs.

    For the CUPS interfacing the printer, yes. But I think for others, which
    hand off to CUPS, that won't be necessary, or at least it should be
    usable without a PPD?

    Judging from the specs, <URL:https://www.canon.ca/en/product?name=imageCLASS_MF663Cdw#specifications>
    $ nc mf663cdw.local 9100 < /some/sample/pdf
    # lpadmin -p mf663cdw -E -v ipp://mf663cdw.local/ipp/print -m everywhere
    # cupsenable mf663cdw && cupsaccept mf663cdw
    $ lp -d mf663cdw /some/sample/pdf

    John
    groenveld@acm.org
    --- Synchronet 3.21a-Linux NewsLink 1.2
  • From Lars Poulsen@lars@beagle-ears.com to alt.comp.periphs.printers,comp.periphs.printers on Wed Dec 24 03:32:00 2025
    From Newsgroup: comp.periphs.printers

    *** Problem (mostly) resolved ***

    I finally solved most of the most vexing parts of my problem, and as so
    often, it is kind of embarrassing. It was an unstable DNS setup in my
    network.

    My office's LAN is kind of unusual in that we have a whole class C
    network (x.y.x.0/24) that is globally routable. It is mostly for
    historical reasons; because we were a network hardware manufacturer, I
    asked out bandwidth provider for it, and they agreed. And they have let
    us keep it. Our security is provided by a Linux system that routes
    between our subnet and the internet, and we run iptables filters there.

    We have separated name resolution for our domain between inside clients
    and outside clients. The server for outside clients is hosted at
    Cloudflare and maintained via their web interface. The zone for inside
    clients runs in the edge router, with a slave server on our main file
    server system. We try to keep the zones synced, and we actually have
    most of our internal host names resolved in the "public" zone so that if
    users get sloppy and configure the name server on their PC as 1.1.1.1 or 9.9.9.9 everything still works. But somehow the 3 servers (Cloudflare
    and our 2 inhouse) were getting out of sync when I made updates to try
    new versions.

    Once I got the DNS issues squared away, all the Windows, MAC and iPhone
    clients started working and stayed working.

    The CUPS client on the file server that I would like to use as a spool
    pool still does not like the printer, but that will have to wait until
    my other fires have been put out.

    My takeaway is to add DNS to my daily checklist, specifically checking
    for hostnames that have recently been adjusted as well as the 5 most
    important ones.
    --
    Lars Poulsen - an old geek in Santa Barbara, California
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