If you run the client with the -allow_remote_gui_rpc command line option, it will accept connections from any host.

You can create a file remote_hosts.cfg in your BOINC directory containing a list of allowed dns host names or ip addresses (one per line). Those hosts will be able to connect. The remote_hosts.cfg file can have comment lines that start with either a # or a ; character as well. "; page_tail(); ?>