Canon LBP7660Cdn Manual page 459

When using proxy functions
Select the [Use Proxy] check box, and set the following items.
[HTTP Proxy Server
Address]
[HTTP Proxy Server
Port Number]
[Use Proxy within
Same Domain]
When not using proxy functions
Clear the [Use Proxy] check box.
(3) Set proxy authentication functions.
When using proxy authentication functions
Enter the address of the proxy server used by the proxy functions.
Enter the port number of the proxy server used by the proxy functions. You can set
it between [0] and [99999].
When the check box is selected, use the proxy function within the same domain.