Arch Linux

Tyrin Price

Member

Registered: 2020-11-25

Posts: 6

[SOLVED] Cannot Connect to localhost for CUPS Web

I have a Brother HL-2170W and got it working with CUPS using the web interface. This was months ago.

Just bought a new wireless printer, connected it to my network ... then tried to access CUPS web ...

http://localhost:631/

...with chrome and got "This site can’t be reached. localhost refused to connect."

I don't understand why it stopped working.

Here is the output of...
systemctl status cups.socket
● cups.socket - CUPS Scheduler
     Loaded: loaded (/usr/lib/systemd/system/cups.socket; enabled; vendor prese>
     Active: inactive (dead)
   Triggers: ● cups.service
     Listen: /run/cups/cups.sock (Stream)

Output of...
systemctl status cups.service
● cups.service - CUPS Scheduler
     Loaded: loaded (/usr/lib/systemd/system/cups.service; disabled; vendor pre>
     Active: inactive (dead)
TriggeredBy: ● cups.socket

My understanding is that cups.socket should start cups.service when accessed and I should be able to access the web interface.

Any troubleshooting help is appreciated.

Last edited by Tyrin Price (2020-12-12 12:29:04)

Tyrin Price

Member

Registered: 2020-11-25

Posts: 6

Re: [SOLVED] Cannot Connect to localhost for CUPS Web

SOLVED: Needed to add access in /etc/cups/cups.conf

elParaguayo

Member

Registered: 2018-03-30

Posts: 51

Re: [SOLVED] Cannot Connect to localhost for CUPS Web

Can you confirm which section you needed to update in the conf file?

I've got the same issue so I'd be keen to fix this via your solution rather than just enabling cups.service

Tyrin Price

Member

Registered: 2020-11-25

Posts: 6

Re: [SOLVED] Cannot Connect to localhost for CUPS Web

From /etc/cups/cupsd.conf

# Web interface setting...
WebInterface Yes

# Restrict access to the server...
<Location />
  Order allow,deny
Allow From 192.168.1.*
Allow @LOCAL
</Location>

zpg443

Member

Registered: 2016-12-03

Posts: 315

Re: [SOLVED] Cannot Connect to localhost for CUPS Web

Please post entire /etc/cups/cupsd.conf with proper code formatting/

Tyrin Price

Member

Registered: 2020-11-25

Posts: 6

Re: [SOLVED] Cannot Connect to localhost for CUPS Web

Please post entire /etc/cups/cupsd.conf with proper code formatting/

I am new to these forums... how is that done?

2ManyDogs

Forum Fellow

Registered: 2012-01-15

Posts: 4,648

Re: [SOLVED] Cannot Connect to localhost for CUPS Web

I am new to these forums... how is that done?

See the "Code" section in the BBCode help (linked at the bottom of the Reply box): https://bbs.archlinux.org/help.php#bbcode

Tyrin Price

Member

Registered: 2020-11-25

Posts: 6

Re: [SOLVED] Cannot Connect to localhost for CUPS Web

Please post entire /etc/cups/cupsd.conf with proper code formatting/

Here is /etc/cups/cupsd.conf

#
# 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
#PageLogFormat

# Specifies the maximum size of the log files before they are rotated.  The valu
e "0" disables log rotation.
MaxLogSize 0

# Default error policy for printers
ErrorPolicy stop-printer

# Only listen for connections from the local machine.
Listen localhost:631
Listen /run/cups/cups.sock

# Show shared printers on the local network.
Browsing On
BrowseLocalProtocols dnssd

# 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 192.168.1.*
Allow @LOCAL
</Location>

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

# Restrict access to configuration files...
<Location /admin/conf>
  AuthType Default
  Require user @SYSTEM
  Order allow,deny
</Location>

# Restrict access to log files...
<Location /admin/log>
  AuthType Default
  Require user @SYSTEM
  Order allow,deny
</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
  </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
  </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
  </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
  </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
  </Limit>

  <Limit All>
    Order deny,allow
  </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
  </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
  </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
  </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
 </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
  </Limit>

  <Limit All>
    Order deny,allow
  </Limit>
</Policy>

# Set the kerberized printer/job policies...
<Policy kerberos>
  # 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 Negotiate
    Order deny,allow
  </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 Negotiate
    Require user @OWNER @SYSTEM
    Order deny,allow
  </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
  </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
  </Limit>

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

  <Limit All>
    Order deny,allow
  </Limit>
</Policy>

zpg443

Member

Registered: 2016-12-03

Posts: 315

Re: [SOLVED] Cannot Connect to localhost for CUPS Web

Try with this section revised as follows (removing Allow From 192.168.1.* and Allow @LOCAL:)

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

After revising this way, restart cups

jdoggsc

Member

Registered: 2011-08-15

Posts: 99

Re: [SOLVED] Cannot Connect to localhost for CUPS Web

you mentioned on Nov. 24 that this was solved by adding access in the cups.conf file.  Is this solved?  If so, please edit the title in the original post and prepend [SOLVED] to it.

I had a problem 5 days ago where tried printing and I had no printers (expect print to file).  Also, the web interface at 127.0.0.1:631 was not responding.  This was caused by cups changing the names of the .service files in /lib/systemd/system.  it used to be called org.cups.cupsd.service.  Now it's called cups.service.  I disabled org.cups.cupsd.service and enabled cups.service and I'm back to normal.
Is this unrelated to what you're experiencing?  With cups failing to be started at boot, this would also make it so that you can't access the interface through 127.0.0.1:631

Tyrin Price

Member

Registered: 2020-11-25

Posts: 6

Re: [SOLVED] Cannot Connect to localhost for CUPS Web

I had originally tried restarting just cups.service with no change. By adding those addresses to the "# Restrict access to the server..." section and restarting the service it was corrected.

But, now I commented those addresses out, restarted cups.service, and it still worked. So, I deleted those addresses completely, restarted the service, and it still works.

This is the relevant section of /etc/cups/cupsd.conf now

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

I am not sure what fixed it, now.