yar...that's is so simple u just need to forward sum port...if ur not unable to sign in.
Try it ! It worked 4 me.
The Ports Are As Follows
Exeternal Port Start External Port End Portocol Internal Port Start Internal Port End
1863 1863 TCP/UDP 1863 1863
5190 5190 TCP/UDP 5190 5190
6891 6900 TCP/UDP 6891 6900
6901 6901 TCP/UDP 6901 6901