Enabling access to Cups admin port (631)

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This is on a dedicate server, CentOS 7.4. I am unable to access the Cups admin pages on port 631. I have allowed my IP address access to all services through host access control and have verified that port 631 is specified as a common TCP ingress port in conf.apf. I know this is a firewall issue because if I temporarily stop the iptables firewall service, I can access the admin pages fine.

Thanks for any guidance.
Hello gfryberger,

Thank you for letting us know you were able to access the Cups admin pages by adding the ports to the conf.apf file. We're glad you were able to get it working!

Thank you,