Have you changed the security level on your server recently? It's possible that it doesn't like the ticket-based authentication that the plugin is doing.
I've been meaning to bring some sanity to the error output of the plugin, but haven't really gotten around to it. If you are still having trouble by next week, then I should have a new release that will give more meaningful log information.
~Rob
PS. That hash is the authentication ticket retrieved during login, not the hash of the perforce port.