On a debian stable I've a network printer connected and shared (epson hp1536dnf):

socket://ip:9100

from linux clients I've:

ipp://ip/printers/printer1

The logs of server are:

D [01/Sep/2017:18:21:29 +0200] cupsdSetBusyState: newbusy="Not busy", busy="Active clients"
D [01/Sep/2017:18:21:29 +0200] [Client 33] HTTP_STATE_WAITING Closing for error 32 (Broken pipe)
D [01/Sep/2017:18:21:29 +0200] [Client 33] Closing connection.

The printing goes to server but none print on printer. From server the printer works correctly.

EDIT: changing printer driver I solved the problem.

I'm looking to get access to the admin page of the CUPS web interface.

I can reach the page, and I can browse the majority of the site, but sadly the Admin page is still locked from remote sources.

I did set Allow from all and also tried Allow all everywhere now, and still I can't access the page.

What am I missing?

Config file

#
#
# Sample configuration file for the CUPS scheduler.  See "man cupsd.conf" for a
# complete description of this file.
#

# Log general information in error_log - change "warn" to "debug"
# for troubleshooting...
LogLevel warn

# Deactivate CUPS' internal logrotating, as we provide a better one, especially
# LogLevel debug2 gets usable now
MaxLogSize 0

# Allow connection from remote hosts
Port 631
Listen /var/run/cups/cups.sock

# Show shared printers on the local network.
Browsing On
BrowseOrder allow,deny
BrowseAllow all
BrowseLocalProtocols all

# Default authentication type, when authentication is required...
DefaultAuthType Basic

# Web interface setting...
WebInterface Yes

# Restrict access to the server...
<Location />
  Order allow,deny
  Allow from all
</Location>

# Restrict access to the admin pages...
<Location /admin>
  Order allow,deny
  Allow from all
</Location>

# Restrict access to configuration files...
<Location /admin/conf>
  AuthType Default
  Order allow,deny
  Allow from all
</Location>

# Set the default printer/job policies...
<Policy default>
  # Job/subscription privacy...
  JobPrivateAccess default
  JobPrivateValues default
  SubscriptionPrivateAccess default
  SubscriptionPrivateValues default

  # Job-related operations must be done by the owner or an administrator...
  <Limit Create-Job Print-Job Print-URI Validate-Job>
    Order deny,allow
    Allow from all
  </Limit>

  <Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job Cancel-My-Jobs Close-Job CUPS-Move-Job CUPS-Get-Document>
    Require user @OWNER @SYSTEM
    Order deny,allow
    Allow from all
  </Limit>

  # All administration operations require an administrator to authenticate...
  <Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default CUPS-Get-Devices>
    AuthType Default
    Require user @SYSTEM
    Order deny,allow
    Allow from all
  </Limit>

  # All printer operations require a printer operator to authenticate...
  <Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After Cancel-Jobs CUPS-Accept-Jobs CUPS-Reject-Jobs>
    AuthType Default
    Require user @SYSTEM
    Order deny,allow
    Allow from all
  </Limit>

  # Only the owner or an administrator can cancel or authenticate a job...
  <Limit Cancel-Job CUPS-Authenticate-Job>
    Require user @OWNER @SYSTEM
    Order deny,allow
    Allow from all
  </Limit>

  <Limit All>
    Order deny,allow
    Allow from all
  </Limit>
</Policy>

# Set the authenticated printer/job policies...
<Policy authenticated>
  # Job/subscription privacy...
  JobPrivateAccess default
  JobPrivateValues default
  SubscriptionPrivateAccess default
  SubscriptionPrivateValues default

  # Job-related operations must be done by the owner or an administrator...
  <Limit Create-Job Print-Job Print-URI Validate-Job>
    AuthType Default
    Order deny,allow
    Allow from all
  </Limit>

  <Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job Cancel-My-Jobs Close-Job CUPS-Move-Job CUPS-Get-Document>
    AuthType Default
    Require user @OWNER @SYSTEM
    Order deny,allow
    Allow from all
  </Limit>

  # All administration operations require an administrator to authenticate...
  <Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default>
    AuthType Default
    Require user @SYSTEM
    Order deny,allow
    Allow from all
  </Limit>

  # All printer operations require a printer operator to authenticate...
  <Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After Cancel-Jobs CUPS-Accept-Jobs CUPS-Reject-Jobs>
    AuthType Default
    Require user @SYSTEM
    Order deny,allow
    Allow from all
  </Limit>

  # Only the owner or an administrator can cancel or authenticate a job...
  <Limit Cancel-Job CUPS-Authenticate-Job>
    AuthType Default
    Require user @OWNER @SYSTEM
    Order deny,allow
    Allow from all
  </Limit>

  <Limit All>
    Order deny,allow
    Allow from all
  </Limit>
</Policy>

Dockerfile

#
#   Add a Printer user
#
RUN useradd \
    --groups=sudo,lp,lpadmin \
    --create-home \
    --home-dir=/home/print \
    --shell=/bin/bash \
    print

#
#   Set the password for the printer user
#
RUN echo print:sdsds | chpasswd

I run CUPS printing on a number of multiuser Linux application servers. The systems are RHEL or CentOS version 4, 5 or 6. Starting the EL5, the CUPS print server defaults to an error policy that basically disables the printer when there's an error or interruption (USB cable disconnect, network error, paper jam, etc.). This is the ErrorPolicy directive in printer's stanza in the /etc/cups/printers.conf file.

<Printer backupZ4>
Info backupZ4
DeviceURI socket://backupZ4:9100
State Idle
Accepting Yes
Shared Yes
JobSheets none none
QuotaPeriod 0
PageLimit 0
KLimit 0
OpPolicy default
ErrorPolicy stop-printer
</Printer>

I normally change this field to ErrorPolicy retry-job manually in the config file or when I create the printer via the command line:

lpadmin -p backupZ4 -v socket://backupZ4:9100 -o printer-error-policy=retry-job -E 

When other users or vendors manage the print system, they often forget this change, which results in printers being hard disabled following a paper jam or other blips that need to be corrected with a cupsenable.

I'd like to know how to make retry-job the default ErrorPolicy in CUPS versus stop-printer.

My local CUPS server is confused about the name of the printer I use. It has two names: hpext and hpext@vm-cups. I can never predict which one is going to work, and if I use the wrong one, jobs just sit in its queue indefinitely.

There are no printers listed in /etc/cupsd/cupsd.conf; instead I have the line

BrowsePoll cups.eecs.tufts.edu

This server lists only hpext and not hpext@vm-cups.
I'm thinking that somehow my local server is confused, and if I can delete the printer from its memory, all will be well. But nowhere in the documentation can I find a command to delete a printer, and the DELETE PRINTER button on the stupid web interface has no effect.

What can I do?

I'm running CentOS on a storage server that has to do file sharing for with Windows machines. SMB version is smbd version 3.5.5-68.fc13

I'm getting a lot of error messages in /var/log/messages regarding failed attempts to connect to a CUPS server. They look like this:

Nov 30 18:49:34 big03 smbd[9927]: [2010/11/30 18:49:34.850620,  0] printing/print_cups.c:108(cups_connect)
Nov 30 18:49:34 big03 smbd[9927]:   Unable to connect to CUPS server localhost:631 - Connection refused

I understand that the issue is generated by the fact that SMB comes with printer sharing support, but I'm really not interested in that. I just want to disable the feature to get rid of the messages.

Any idea how I can do that?