Added in 1.9.0
/socklisten [-dpE] [bindip] <name> [port] [certificate]
-d - Switch indicates that you specified an ip address as the bind address.
-p - Enables UPnP support for the listening socket, if that is available.
-E - Creates a SSL listening socket. (AdiIRC only)
[bindip] - Ip address to bind to. (used with -d)
<name> - Name to give the listening connection.
[port] - Port to listen on.
[certificate] - the SSL certificate pfx file to use with -E, if not specified, the global client certificate is used. (AdiIRC only)