Tumbleweed KDE Cups Server asks for root password

AlInAussieland · July 28, 2026, 9:28am

I have a Network Printer on a home Network, Brother MFC-L8690CDW
By the way, it works perfectly fine on another laptop running Fedora 44 KDE, including the build in scanner.

But Suse Tumbleweed KDE is a whole different story. The Printer has been added by using the driverless setting, same as in Fedora.
Turning off firewalld made the printer show up under Printers in system settings.
So far I have been able to add User to the cups settings and the Printer now shows up under Printers with firewalld turned back on.

Two outstanding issues:

Everytime I click on the Printer, Cups asks for root password
A Test Page shows up in the cue but does not make it to the Printer.
BTY, scanner doesn’t show up either, but works on Fedora as well.

deano_ferrari · July 28, 2026, 9:40am

You don’t need to disable the firewall for driverless printing. Instead, make sure the mDNS service is allowed through the firewall, as driverless (IPP Everywhere/AirPrint) printer discovery relies on it.

https://en.opensuse.org/Concepts_printing

As for the other issues, please share the output from
lpstat -e
lpstat -t

Also, when you say the test page stays in the queue, does its status eventually change to “completed”, or does it remain queued or stop with an error? That will help determine whether this is a discovery issue, a CUPS authentication issue, or a communication problem with the printer.

For the scanner, make sure sane-airscan is installed first.

https://en.opensuse.org/SDB:Configuring_Scanners

deano_ferrari · July 28, 2026, 9:46am

Regarding the root password prompt, does it happen when electing the printer in KDE System Settings, or only when you try to modify settings or print a test page? The latter is as expected as those actions require administrative privileges.

AlInAussieland · July 28, 2026, 11:05am

No, the status never says completed. It just stays in the queue and I am also unable to cancel the Test printing job.

Here is the requested output from lpstat-e

lpstat -e
MFC-L8690CDW_series

And here is the output from lpstat -t

lpstat -t
scheduler is running
no system default destination
device for MFC-L8690CDW_series: ipp://BRW9C305B72D925.local:631/ipp/print
MFC-L8690CDW_series accepting requests since Tue 28 Jul 2026 17:57:01 AEST
printer MFC-L8690CDW_series is idle.  enabled since Tue 28 Jul 2026 17:57:01 AEST

hcvv · July 28, 2026, 11:07am

When there is only one printing device, I guess setting it as default will route prints to it when not specified different.

AlInAussieland · July 28, 2026, 11:08am

Now here is the output of the working system on Fedora:

lpstat -e
Brother_MFC_L8690CDW_series
MFC-L8690CDW_series

lpstat -t
scheduler is running
system default destination: MFC-L8690CDW_series
device for MFC-L8690CDW_series: ipp://BRW9C305B72D925.local:631/ipp/print
MFC-L8690CDW_series accepting requests since Thu 16 Jul 2026 17:54:10
printer MFC-L8690CDW_series is idle.  enabled since Thu 16 Jul 2026 17:54:10

AlInAussieland · July 28, 2026, 11:40am

So it appears that the printer never fully installs properly as it comes up with : couldn’t resolve mdns…
But mdns is up and running.

deano_ferrari · July 28, 2026, 5:41pm

The Fedora lpstat output confirms the printer is discovered and treated as an IPP printer. It is online and ready to print. Do you not observe the same with openSUSE? Again, did you check the firewall is allowing mdns? Please confirm that you read the wiki page I linked to regarding this.

Where/when do you see this message?

deano_ferrari · July 28, 2026, 7:19pm

I missed that you’d also obtained similar output from the openSUSE host. The printer is listed so mDNS is working as expected, and CUPS is handling it as a driverless IPP printer.

Can you resolve the printer’s hostname?
ping -c3 BRW9C305B72D925.local

Regarding the print jobs, it might be useful to examine some verbose logging from CUPS…
sudo cupsctl --debug-logging
sudo tail -100 /var/log/cups/error_log
The error_log can get very lengthy. I sometimes delete the file, and let CUPS regenerate it during the next print job attempt. That way I have less to trawl through.

AlInAussieland · July 28, 2026, 7:22pm

This message comes up during Printer discovery and attempted setup in Suse KDE “System Settings/Printers/Add”
The message appears in the top section of the GUI. First in a green bar it says that Suse is configuring the Printer which then is followed by a red bar saying the it couldn’t resolve mdns…

deano_ferrari · July 28, 2026, 7:26pm

There shouldn’t actually be any need to explicitly configure it. CUPS should discover and enumerate it dynamically. (That’s how I use my workplace network printers.)

In any case, if you’d like to make a persistent configuration, try temporarily creating the queue using its IP address instead.

deano_ferrari · July 28, 2026, 7:28pm

BTW, do these fail to resolve?

getent hosts BRW9C305B72D925.local
ping -c3 BRW9C305B72D925.local
avahi-resolve-host-name BRW9C305B72D925.local

deano_ferrari · July 28, 2026, 7:35pm

Also, if the above commands fail, check that nss-mdns is installed…
zypper se -si nss-mdns

AlInAussieland · July 28, 2026, 7:50pm

zypper se -si nss-mdns
Loading repository data...
Reading installed packages...

S  | Name           | Type    | Version    | Arch   | Repository
---+----------------+---------+------------+--------+-----------
i  | nss-mdns       | package | 0.15.1-2.4 | x86_64 | repo-oss
i  | nss-mdns-32bit | package | 0.15.1-2.4 | x86_64 | repo-oss

Again Printer installation never finishes:
After Add Printer (the one it found), I set it as default, Green bar configuring Printer…Red bar, which I finally captured with a screen shot.

deano_ferrari · July 28, 2026, 7:54pm

Yes, but no installation should be necessary for driverless printing. If the printer is discovered by CUPS (as it appears it was), it should just work. Open an application, select a document, and print.

Could you run the requested commands please?

AlInAussieland · July 28, 2026, 7:54pm

Appears to fail…

ping -c3 BRW9C305B72D925.local

ping: BRW9C305B72D925.local: Name or service not known

Followed with a quick ping to the Printer’s IP address from SuSe Tumbleweed shows ping successful returns, so Tumbleweed sees the Printer’s IP being online.

deano_ferrari · July 28, 2026, 7:56pm

Check grep '^hosts:' /etc/nsswitch.conf or grep '^hosts:' /usr/etc/nsswitch.conf
It should be like hosts: files mdns_minimal [NOTFOUND=return] dns

AlInAussieland · July 28, 2026, 7:58pm

sudo tail -100 /var/log/cups/error_log
D [29/Jul/2026:05:33:36 +1000] cupsdSetBusyState: newbusy="Not busy", busy="Active clients"
D [29/Jul/2026:05:33:36 +1000] cupsdAddCert: Adding certificate for PID 0
D [29/Jul/2026:05:33:36 +1000] Discarding unused server-started event...
D [29/Jul/2026:05:33:36 +1000] cupsdSetBusyState: newbusy="Not busy", busy="Not busy"
D [29/Jul/2026:05:33:37 +1000] Report: clients=0
D [29/Jul/2026:05:33:37 +1000] Report: jobs=4
D [29/Jul/2026:05:33:37 +1000] Report: jobs-active=0
D [29/Jul/2026:05:33:37 +1000] Report: printers=0
D [29/Jul/2026:05:33:37 +1000] Report: stringpool-string-count=336
D [29/Jul/2026:05:33:37 +1000] Report: stringpool-alloc-bytes=5264
D [29/Jul/2026:05:33:37 +1000] Report: stringpool-total-bytes=5664
D [29/Jul/2026:05:33:53 +1000] cupsdSetBusyState: newbusy="Active clients", busy="Not busy"
D [29/Jul/2026:05:33:53 +1000] [Client 1] Server address is "/run/cups/cups.sock".
D [29/Jul/2026:05:33:53 +1000] [Client 1] Accepted from localhost (Domain)
D [29/Jul/2026:05:33:53 +1000] [Client 1] Waiting for request.
D [29/Jul/2026:05:33:53 +1000] [Client 1] PUT /admin/conf/cupsd.conf HTTP/1.1
D [29/Jul/2026:05:33:53 +1000] cupsdSetBusyState: newbusy="Active clients", busy="Active clients"
D [29/Jul/2026:05:33:53 +1000] [Client 1] Read: status=200, state=9
D [29/Jul/2026:05:33:53 +1000] [Client 1] No authentication data provided.
D [29/Jul/2026:05:33:53 +1000] cupsdIsAuthorized: username=""
D [29/Jul/2026:05:33:53 +1000] [Client 1] cupsdSendHeader: code=401, type="text/html", auth_type=0
D [29/Jul/2026:05:33:53 +1000] [Client 1] WWW-Authenticate: Basic realm=\"CUPS\", PeerCred, Local trc=\"y\"
D [29/Jul/2026:05:33:53 +1000] [Client 1] Closing connection.
D [29/Jul/2026:05:33:53 +1000] cupsdSetBusyState: newbusy="Not busy", busy="Active clients"
D [29/Jul/2026:05:33:53 +1000] cupsdSetBusyState: newbusy="Active clients", busy="Not busy"
D [29/Jul/2026:05:33:53 +1000] [Client 2] Server address is "/run/cups/cups.sock".
D [29/Jul/2026:05:33:53 +1000] [Client 2] Accepted from localhost (Domain)
D [29/Jul/2026:05:33:53 +1000] [Client 2] Waiting for request.
D [29/Jul/2026:05:33:53 +1000] cupsdSetBusyState: newbusy="Active clients", busy="Active clients"
D [29/Jul/2026:05:33:53 +1000] [Client 3] Server address is "/run/cups/cups.sock".
D [29/Jul/2026:05:33:53 +1000] [Client 3] Accepted from localhost (Domain)
D [29/Jul/2026:05:33:53 +1000] [Client 3] Waiting for request.
D [29/Jul/2026:05:33:53 +1000] [Client 2] HTTP_STATE_WAITING Closing for error 32 (Broken pipe)
D [29/Jul/2026:05:33:53 +1000] [Client 2] Closing connection.
D [29/Jul/2026:05:33:53 +1000] cupsdSetBusyState: newbusy="Not busy", busy="Active clients"
D [29/Jul/2026:05:33:53 +1000] cupsdSetBusyState: newbusy="Active clients", busy="Not busy"
D [29/Jul/2026:05:33:53 +1000] [Client 4] Server address is "/run/cups/cups.sock".
D [29/Jul/2026:05:33:53 +1000] [Client 4] Accepted from localhost (Domain)
D [29/Jul/2026:05:33:53 +1000] [Client 4] Waiting for request.
D [29/Jul/2026:05:33:53 +1000] [Client 3] HTTP_STATE_WAITING Closing for error 32 (Broken pipe)
D [29/Jul/2026:05:33:53 +1000] [Client 3] Closing connection.
D [29/Jul/2026:05:33:53 +1000] cupsdSetBusyState: newbusy="Not busy", busy="Active clients"
D [29/Jul/2026:05:33:53 +1000] [Client 4] PUT /admin/conf/cupsd.conf HTTP/1.1
D [29/Jul/2026:05:33:53 +1000] cupsdSetBusyState: newbusy="Active clients", busy="Not busy"
D [29/Jul/2026:05:33:53 +1000] [Client 4] Read: status=200, state=9
D [29/Jul/2026:05:33:53 +1000] [Client 4] Authorized as root using PeerCred.
D [29/Jul/2026:05:33:53 +1000] cupsdIsAuthorized: username="root"
I [29/Jul/2026:05:33:53 +1000] [Client 4] Installing config file "/etc/cups/cupsd.conf"...
D [29/Jul/2026:05:33:53 +1000] [Client 4] cupsdSendHeader: code=201, type="(null)", auth_type=0
D [29/Jul/2026:05:33:53 +1000] cupsdSetBusyState: newbusy="Not busy", busy="Active clients"
D [29/Jul/2026:05:33:53 +1000] [Client 4] Closing connection.
D [29/Jul/2026:05:33:53 +1000] cupsdSetBusyState: newbusy="Not busy", busy="Not busy"
E [29/Jul/2026:05:33:53 +1000] Scheduler shutting down due to program error.
D [29/Jul/2026:05:33:53 +1000] Discarding unused server-stopped event...
D [29/Jul/2026:05:33:53 +1000] Creating KeepAlive/PID file "/var/cache/cups/org.cups.cupsd".
I [29/Jul/2026:05:33:53 +1000] Saving job.cache...
D [29/Jul/2026:05:33:53 +1000] cupsdStopSelect()
I [29/Jul/2026:05:33:53 +1000] Listening to 0.0.0.0:631 (IPv4)
I [29/Jul/2026:05:33:53 +1000] Listening to [v1.::]:631 (IPv6)
I [29/Jul/2026:05:33:53 +1000] Remote access is enabled.
D [29/Jul/2026:05:33:53 +1000] Added auto ServerAlias localhost.localdomain
D [29/Jul/2026:05:33:53 +1000] Added auto ServerAlias localhost
I [29/Jul/2026:05:33:53 +1000] Loaded configuration file "/etc/cups/cupsd.conf"
D [29/Jul/2026:05:33:53 +1000] Using keychain "/etc/cups/ssl" for server name "localhost.localdomain".
I [29/Jul/2026:05:33:53 +1000] Using default TempDir of /var/spool/cups/tmp...
I [29/Jul/2026:05:33:53 +1000] Configured for up to 100 clients.
I [29/Jul/2026:05:33:53 +1000] Allowing up to 100 client connections per host.
I [29/Jul/2026:05:33:53 +1000] Full reload is required.
I [29/Jul/2026:05:33:53 +1000] Loaded MIME database from "/usr/share/cups/mime" and "/etc/cups": 78 types, 114 filters...
I [29/Jul/2026:05:33:53 +1000] Generating printcap /etc/printcap...
I [29/Jul/2026:05:33:53 +1000] Loading job cache file "/var/cache/cups/job.cache"...
E [29/Jul/2026:05:33:53 +1000] [Job 3] Files have gone away.
D [29/Jul/2026:05:33:53 +1000] Scanning /var/spool/cups for jobs...
I [29/Jul/2026:05:33:53 +1000] Full reload complete.
D [29/Jul/2026:05:33:53 +1000] cupsdCleanFiles(path="/var/spool/cups/tmp", pattern="(null)")
I [29/Jul/2026:05:33:53 +1000] Cleaning out old files in "/var/spool/cups/tmp".
D [29/Jul/2026:05:33:53 +1000] cupsdCleanFiles(path="/var/cache/cups", pattern="*.ipp")
I [29/Jul/2026:05:33:53 +1000] Cleaning out old files in "/var/cache/cups".
D [29/Jul/2026:05:33:53 +1000] service_checkin: pid=9754
D [29/Jul/2026:05:33:53 +1000] service_checkin: 1 listeners.
D [29/Jul/2026:05:33:53 +1000] service_add_listener: Listener #1 at fd 3, "/run/cups/cups.sock".
D [29/Jul/2026:05:33:53 +1000] service_add_listener: Adding new listener #1 for /run/cups/cups.sock.
D [29/Jul/2026:05:33:53 +1000] Creating KeepAlive/PID file "/var/cache/cups/org.cups.cupsd".
I [29/Jul/2026:05:33:53 +1000] Listening to 0.0.0.0:631 on fd 7...
I [29/Jul/2026:05:33:53 +1000] Listening to [v1.::]:631 on fd 8...
I [29/Jul/2026:05:33:53 +1000] Listening to /run/cups/cups.sock on fd 3...
I [29/Jul/2026:05:33:53 +1000] Resuming new connection processing...
D [29/Jul/2026:05:33:53 +1000] Avahi server connection now available, registering printers for Bonjour broadcasting.
I [29/Jul/2026:05:33:53 +1000] Defaulting to "DNSSDHostName linux.local".
D [29/Jul/2026:05:33:53 +1000] cupsdSetBusyState: newbusy="Not busy", busy="Active clients"
D [29/Jul/2026:05:33:53 +1000] cupsdAddCert: Adding certificate for PID 0
D [29/Jul/2026:05:33:53 +1000] Discarding unused server-started event...
D [29/Jul/2026:05:33:53 +1000] cupsdSetBusyState: newbusy="Not busy", busy="Not busy"
D [29/Jul/2026:05:33:54 +1000] Report: clients=0
D [29/Jul/2026:05:33:54 +1000] Report: jobs=0
D [29/Jul/2026:05:33:54 +1000] Report: jobs-active=0
D [29/Jul/2026:05:33:54 +1000] Report: printers=0
D [29/Jul/2026:05:33:54 +1000] Report: stringpool-string-count=336
D [29/Jul/2026:05:33:54 +1000] Report: stringpool-alloc-bytes=5264
D [29/Jul/2026:05:33:54 +1000] Report: stringpool-total-bytes=5664
alfred@localhost:~> zypper se -si nss-mdns
Loading repository data...
Reading installed packages...

S  | Name           | Type    | Version    | Arch   | Repository
---+----------------+---------+------------+--------+-----------
i  | nss-mdns       | package | 0.15.1-2.4 | x86_64 | repo-oss
i  | nss-mdns-32bit | package | 0.15.1-2.4 | x86_64 | repo-oss
alfred@localhost:~> sudo tail -100 /var/log/cups/error_log
[sudo] password for root: 
D [29/Jul/2026:05:42:22 +1000] cupsdIsAuthorized: username="root"
D [29/Jul/2026:05:42:22 +1000] [Client 3] 2.0 CUPS-Add-Modify-Printer 18
D [29/Jul/2026:05:42:22 +1000] CUPS-Add-Modify-Printer ipp://alfred@localhost:631/printers/MFC-L8690CDW_series
D [29/Jul/2026:05:42:22 +1000] cupsdIsAuthorized: username="root"
D [29/Jul/2026:05:42:22 +1000] MFC-L8690CDW_series device-uri: Unknown scheme in URI
I [29/Jul/2026:05:42:22 +1000] Setting MFC-L8690CDW_series device-uri to "dnssd://Brother%20MFC-L8690CDW%20series._ipp._tcp.local/?uuid=e3248000-80ce-11db-8000-3c2af4507d30" (was "file:///dev/null".)
I [29/Jul/2026:05:42:22 +1000] Setting MFC-L8690CDW_series printer-is-accepting-jobs to 1 (was 0.)
D [29/Jul/2026:05:42:22 +1000] Discarding unused printer-state-changed event...
D [29/Jul/2026:05:42:22 +1000] cupsdDeregisterPrinter(p=0x55ff65946a00(MFC-L8690CDW_series), removeit=1)
I [29/Jul/2026:05:42:22 +1000] Setting MFC-L8690CDW_series printer-is-shared to 0 (was 1.)
I [29/Jul/2026:05:42:22 +1000] Setting MFC-L8690CDW_series printer-state to 3 (was 5.)
D [29/Jul/2026:05:42:22 +1000] Discarding unused printer-state-changed event...
D [29/Jul/2026:05:42:22 +1000] cupsdMarkDirty(P----)
D [29/Jul/2026:05:42:22 +1000] cupsdSetBusyState: newbusy="Active clients and dirty files", busy="Active clients"
D [29/Jul/2026:05:42:22 +1000] cupsdMarkDirty(P----)
D [29/Jul/2026:05:42:22 +1000] cupsdSetBusyState: newbusy="Active clients and dirty files", busy="Active clients and dirty files"
D [29/Jul/2026:05:42:22 +1000] load_ppd: Loading /etc/cups/ppd/MFC-L8690CDW_series.ppd...
D [29/Jul/2026:05:42:22 +1000] cupsdRegisterPrinter(p=0x55ff65946a00(MFC-L8690CDW_series))
D [29/Jul/2026:05:42:22 +1000] [Client 3] Creating PPD in background thread.
D [29/Jul/2026:05:42:22 +1000] Report: clients=1
D [29/Jul/2026:05:42:22 +1000] Report: jobs=0
D [29/Jul/2026:05:42:22 +1000] Report: jobs-active=0
D [29/Jul/2026:05:42:22 +1000] Report: printers=1
D [29/Jul/2026:05:42:22 +1000] Report: stringpool-string-count=426
D [29/Jul/2026:05:42:22 +1000] Report: stringpool-alloc-bytes=7120
D [29/Jul/2026:05:42:22 +1000] Report: stringpool-total-bytes=7832
D [29/Jul/2026:05:42:22 +1000] MFC-L8690CDW_series: Generating PPD file from "dnssd://Brother%20MFC-L8690CDW%20series._ipp._tcp.local/?uuid=e3248000-80ce-11db-8000-3c2af4507d30"...
E [29/Jul/2026:05:42:29 +1000] MFC-L8690CDW_series: Couldn't resolve mDNS URI "dnssd://Brother%20MFC-L8690CDW%20series._ipp._tcp.local/?uuid=e3248000-80ce-11db-8000-3c2af4507d30".
D [29/Jul/2026:05:42:29 +1000] CUPS-Add-Modify-Printer server-error-device-error: Couldn\'t resolve mDNS URI \"dnssd://Brother%20MFC-L8690CDW%20series._ipp._tcp.local/?uuid=e3248000-80ce-11db-8000-3c2af4507d30\".
E [29/Jul/2026:05:42:29 +1000] [Client 3] Returning IPP server-error-device-error for CUPS-Add-Modify-Printer (ipp://alfred@localhost:631/printers/MFC-L8690CDW_series) from localhost.
D [29/Jul/2026:05:42:29 +1000] [Client 3] Content-Length: 221
D [29/Jul/2026:05:42:29 +1000] [Client 3] cupsdSendHeader: code=200, type="application/ipp", auth_type=0
D [29/Jul/2026:05:42:29 +1000] [Client 3] con->http=0x55ff658f3eb0
D [29/Jul/2026:05:42:29 +1000] [Client 3] cupsdWriteClient error=0, used=0, state=HTTP_STATE_POST_SEND, data_encoding=HTTP_ENCODING_LENGTH, data_remaining=221, response=0x55ff659073d0(IPP_STATE_DATA), pipe_pid=0, file=-1
D [29/Jul/2026:05:42:29 +1000] [Client 3] Writing IPP response, ipp_state=IPP_STATE_DATA, old wused=0, new wused=0
D [29/Jul/2026:05:42:29 +1000] [Client 3] bytes=0, http_state=0, data_remaining=221
D [29/Jul/2026:05:42:29 +1000] [Client 3] Flushing write buffer.
D [29/Jul/2026:05:42:29 +1000] [Client 3] New state is HTTP_STATE_WAITING
D [29/Jul/2026:05:42:29 +1000] [Client 3] Waiting for request.
D [29/Jul/2026:05:42:29 +1000] cupsdSetBusyState: newbusy="Dirty files", busy="Active clients and dirty files"
D [29/Jul/2026:05:42:29 +1000] cupsdMarkDirty(P----)
D [29/Jul/2026:05:42:29 +1000] cupsdSetBusyState: newbusy="Dirty files", busy="Dirty files"
D [29/Jul/2026:05:42:29 +1000] Discarding unused printer-stopped event...
D [29/Jul/2026:05:42:29 +1000] cupsdDeregisterPrinter(p=0x55ff65946a00(MFC-L8690CDW_series), removeit=1)
D [29/Jul/2026:05:42:29 +1000] Calling FindDeviceById(cups-MFC-L8690CDW_series)
D [29/Jul/2026:05:42:29 +1000] FindDeviceById failed: org.freedesktop.DBus.Error.ServiceUnknown:The name is not activatable
I [29/Jul/2026:05:42:53 +1000] Saving printers.conf...
D [29/Jul/2026:05:42:53 +1000] cupsdSetBusyState: newbusy="Not busy", busy="Dirty files"
D [29/Jul/2026:05:43:39 +1000] [Client 3] POST /admin/ HTTP/1.1
D [29/Jul/2026:05:43:39 +1000] cupsdSetBusyState: newbusy="Active clients", busy="Not busy"
D [29/Jul/2026:05:43:39 +1000] [Client 3] Read: status=200, state=6
D [29/Jul/2026:05:43:39 +1000] [Client 3] Authorized as "root" using Basic.
D [29/Jul/2026:05:43:39 +1000] cupsdIsAuthorized: username="root"
D [29/Jul/2026:05:43:39 +1000] [Client 3] 2.0 CUPS-Add-Modify-Printer 19
D [29/Jul/2026:05:43:39 +1000] CUPS-Add-Modify-Printer ipp://alfred@localhost:631/printers/MFC-L8690CDW_series
D [29/Jul/2026:05:43:39 +1000] cupsdIsAuthorized: username="root"
D [29/Jul/2026:05:43:39 +1000] MFC-L8690CDW_series device-uri: Unknown scheme in URI
I [29/Jul/2026:05:43:39 +1000] Setting MFC-L8690CDW_series device-uri to "dnssd://Brother%20MFC-L8690CDW%20series._ipp._tcp.local/?uuid=e3248000-80ce-11db-8000-3c2af4507d30" (was "file:///dev/null".)
I [29/Jul/2026:05:43:39 +1000] Setting MFC-L8690CDW_series printer-is-accepting-jobs to 1 (was 0.)
D [29/Jul/2026:05:43:39 +1000] Discarding unused printer-state-changed event...
D [29/Jul/2026:05:43:39 +1000] cupsdDeregisterPrinter(p=0x55ff65867700(MFC-L8690CDW_series), removeit=1)
I [29/Jul/2026:05:43:39 +1000] Setting MFC-L8690CDW_series printer-is-shared to 0 (was 1.)
I [29/Jul/2026:05:43:39 +1000] Setting MFC-L8690CDW_series printer-state to 3 (was 5.)
D [29/Jul/2026:05:43:39 +1000] Discarding unused printer-state-changed event...
D [29/Jul/2026:05:43:39 +1000] cupsdMarkDirty(P----)
D [29/Jul/2026:05:43:39 +1000] cupsdSetBusyState: newbusy="Active clients and dirty files", busy="Active clients"
D [29/Jul/2026:05:43:39 +1000] cupsdMarkDirty(P----)
D [29/Jul/2026:05:43:39 +1000] cupsdSetBusyState: newbusy="Active clients and dirty files", busy="Active clients and dirty files"
D [29/Jul/2026:05:43:39 +1000] load_ppd: Loading /etc/cups/ppd/MFC-L8690CDW_series.ppd...
D [29/Jul/2026:05:43:39 +1000] cupsdRegisterPrinter(p=0x55ff65867700(MFC-L8690CDW_series))
D [29/Jul/2026:05:43:39 +1000] [Client 3] Creating PPD in background thread.
D [29/Jul/2026:05:43:39 +1000] Report: clients=1
D [29/Jul/2026:05:43:39 +1000] Report: jobs=0
D [29/Jul/2026:05:43:39 +1000] Report: jobs-active=0
D [29/Jul/2026:05:43:39 +1000] Report: printers=1
D [29/Jul/2026:05:43:39 +1000] Report: stringpool-string-count=427
D [29/Jul/2026:05:43:39 +1000] Report: stringpool-alloc-bytes=7120
D [29/Jul/2026:05:43:39 +1000] Report: stringpool-total-bytes=7840
D [29/Jul/2026:05:43:39 +1000] MFC-L8690CDW_series: Generating PPD file from "dnssd://Brother%20MFC-L8690CDW%20series._ipp._tcp.local/?uuid=e3248000-80ce-11db-8000-3c2af4507d30"...
E [29/Jul/2026:05:43:46 +1000] MFC-L8690CDW_series: Couldn't resolve mDNS URI "dnssd://Brother%20MFC-L8690CDW%20series._ipp._tcp.local/?uuid=e3248000-80ce-11db-8000-3c2af4507d30".
D [29/Jul/2026:05:43:46 +1000] CUPS-Add-Modify-Printer server-error-device-error: Couldn\'t resolve mDNS URI \"dnssd://Brother%20MFC-L8690CDW%20series._ipp._tcp.local/?uuid=e3248000-80ce-11db-8000-3c2af4507d30\".
E [29/Jul/2026:05:43:46 +1000] [Client 3] Returning IPP server-error-device-error for CUPS-Add-Modify-Printer (ipp://alfred@localhost:631/printers/MFC-L8690CDW_series) from localhost.
D [29/Jul/2026:05:43:46 +1000] [Client 3] Content-Length: 221
D [29/Jul/2026:05:43:46 +1000] [Client 3] cupsdSendHeader: code=200, type="application/ipp", auth_type=0
D [29/Jul/2026:05:43:46 +1000] [Client 3] con->http=0x55ff658f3eb0
D [29/Jul/2026:05:43:46 +1000] [Client 3] cupsdWriteClient error=0, used=0, state=HTTP_STATE_POST_SEND, data_encoding=HTTP_ENCODING_LENGTH, data_remaining=221, response=0x55ff65935210(IPP_STATE_DATA), pipe_pid=0, file=-1
D [29/Jul/2026:05:43:46 +1000] [Client 3] Writing IPP response, ipp_state=IPP_STATE_DATA, old wused=0, new wused=0
D [29/Jul/2026:05:43:46 +1000] [Client 3] bytes=0, http_state=0, data_remaining=221
D [29/Jul/2026:05:43:46 +1000] [Client 3] Flushing write buffer.
D [29/Jul/2026:05:43:46 +1000] [Client 3] New state is HTTP_STATE_WAITING
D [29/Jul/2026:05:43:46 +1000] [Client 3] Waiting for request.
D [29/Jul/2026:05:43:46 +1000] cupsdSetBusyState: newbusy="Dirty files", busy="Active clients and dirty files"
D [29/Jul/2026:05:43:46 +1000] cupsdMarkDirty(P----)
D [29/Jul/2026:05:43:46 +1000] cupsdSetBusyState: newbusy="Dirty files", busy="Dirty files"
D [29/Jul/2026:05:43:46 +1000] Discarding unused printer-stopped event...
D [29/Jul/2026:05:43:46 +1000] cupsdDeregisterPrinter(p=0x55ff65867700(MFC-L8690CDW_series), removeit=1)
D [29/Jul/2026:05:43:46 +1000] Calling FindDeviceById(cups-MFC-L8690CDW_series)
D [29/Jul/2026:05:43:46 +1000] FindDeviceById failed: org.freedesktop.DBus.Error.ServiceUnknown:The name is not activatable
I [29/Jul/2026:05:44:10 +1000] Saving printers.conf...
D [29/Jul/2026:05:44:10 +1000] cupsdSetBusyState: newbusy="Not busy", busy="Dirty files"

AlInAussieland · July 28, 2026, 8:03pm

grep '^hosts:' /etc/nsswitch.conf
hosts: files mdns_minimal [NOTFOUND=return] dns

deano_ferrari · July 28, 2026, 8:04pm

The crux of the issue…

MFC-L8690CDW_series: Couldn't resolve mDNS URI "dnssd://Brother%20MFC-L8690CDW%20series._ipp._tcp.local/?uuid=e3248000-80ce-11db-8000-3c2af4507d30".

So we need to find out if the nsswitch file is correctly configured as already mentioned.