В конфигураторе cups'а изначально разрешено подключение к web админке только для 127.0.0.1
У меня сеть только внутренняя, поэтому я открыл всё, чтобы не парится. в \etc\cups\cupsd.conf у меня вот так:
[root@cent cups]# cat cupsd.conf
#
# "$Id: cupsd.conf.in 5454 2006-04-23 21:46:38Z mike $"
#
# Sample configuration file for the Common UNIX Printing System (CUPS)
# scheduler. See "man cupsd.conf" for a complete description of this
# file.
#
MaxLogSize 2000000000
# Log general information in error_log - change "info" to "debug" for
# troubleshooting...
LogLevel info
# Administrator user group...
SystemGroup sys root
# Only listen for connections from the local machine.
Listen localhost:631
Listen 192.168.1.2:631
Listen /var/run/cups/cups.sock
# Show shared printers on the local network.
Browsing On
BrowseOrder allow,deny
# (Change '@LOCAL' to 'ALL' if using directed broadcasts from another subnet.)
BrowseAllow @LOCAL
# Default authentication type, when authentication is required...
DefaultAuthType Basic
# Restrict access to the server...
<Location />
Order allow,deny
Allow localhost
Allow 192.168.1.0/255.255.255.0
</Location>
# Restrict access to the admin pages...
<Location /admin>
# Encryption Required
Order allow,deny
Allow localhost
Allow 192.168.1.0/255.255.255.0
</Location>
# Restrict access to configuration files...
<Location /admin/conf>
AuthType Basic
Require user @SYSTEM
Order allow,deny
Allow localhost
</Location>
# Set the default printer/job policies...
<Policy default>
# Job-related operations must be done by the owner or an adminstrator...
<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 CUPS-Move-Job>
Require user @OWNER @SYSTEM
Order deny,allow
</Limit>
# All administration operations require an adminstrator to authenticate...
<Limit Pause-Printer Resume-Printer Set-Printer-Attributes 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 CUPS-Add-Printer CUPS-Delete-Printer CUPS-Add-Class CUPS-Delete-Class CUPS-Accept-Jobs CUPS-Reject-Jobs CUPS-Set-Default>
# AuthType Basic
# Require user @SYSTEM
Order deny,allow
Allow 192.168.1.0/255.255.255.0
</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
# Allow 192.168.1.0/255.255.255.0
</Limit>
</Policy>
#
# End of "$Id: cupsd.conf.in 5454 2006-04-23 21:46:38Z mike $".
#
[root@cent cups]#