[Serusers] SER doesn't create TCP registrations

[Andrew T Gin]

Hi
I'm having some trouble getting SER working. I am using example Hello 
World example ser.cfg (in Ser-GettingStarted.pdf). My client can 
REGISTER using UDP successfully, but when I to REGISTER with TCP, it fails.

I performed a wireshark trace, and the problem is when the client sends 
a SYN, SER responds with an RST, so the TCP 3 way handshake doesn't finish.

The output of SER shows:
Listening on
            udp: 132.181.9.24 [132.181.9.24]:5060
            tcp: 132.181.9.24 [132.181.9.24]:5060
Aliases:
            tcp: cosc4101.cosc.canterbury.ac.nz:5060
            udp: cosc4101.cosc.canterbury.ac.nz:5060

What have I done wrong?
Thanks
Andrew