If you encounter an error while attempting to access the CUPS web browser interface or you cannot access the interface, see Requirements for Using the CUPS Web Browser Interface to ensure that all of the requirements have been met. In addition, verify your browser's proxy settings to determine whether a proxy server has been configured. If so, try disabling the proxy server, then re-attempt to access the CUPS web browser interface.
To determine whether the CUPS web browser interface is running, you can also attempt to connect to the CUPS port (Port 631) by typing the telnet command in a terminal window, as follows:
mymachine% telnet localhost 631 Trying ::1... Connected to mymachine Escape character is ^]. ^]q telnet> q Connection to mymachine closed. mymachine%
To stop the telnet session, press the Control-]. To quit the telnet session, type q.