error: [Errno 99] Cannot assign requested address for address 2002

[gerbdla]

I am getting this error: error: [Errno 99] Cannot assign requested address for address 1234
This is my sample test:
Test Rammbock
New Protocol simpleRequest
Chars * testing tls
End Protocol
Start TCP Server 122.143.129.52 1234 name=example.example.com
Start TCP Client 122.143.129.51 protocol=simpleRequest
Connect 122.143.129.52 1234
New Message testing tls
u32 status
Client Sends message
Verify server gets status 0xcafebabe