It seems to connect about 1 time in 4 with the "Unable to connect to server (Connection refused)" other times. When a client does connect the connection is very laggy and soon pings out.
Connecting via the server port (currently 9464) is fine, with no lag at all.
I have no firewall running at present, the hosts assure me they haven't either.
Operating system is Cent OS
Any ideas would be appreciated before I lose the rest of my hair