creepMiner forwarding configuration question

[tbarmike]

I wish to forward two computers to my main computer using creepMiner on Linux, but am having difficulty.

I'm using creepMiner 1.5.2 and no matter how I set the configuration files, nonces do not get submitted or accepted on the main machine. I have also tried creepMIner 1.6.0 with the same results.
I do get an error:
tbarmike: could not submit nonce! network issues? (deadline)

From what I understand, I set the host serverURL to an unused local ip.
I set the client submissionURL to the host serverURL, and the client mininginfoURL to the pool ip
e.g.
host

• host ip : 192.168.2.101
• host config:
  serverURL : 192.168.3.150:8400

client

• client ip : 192.168.2.102
• client config:
  mininginfoURL : http://all.poolofd32th.club:8124
  submissionURL : 192.168.3.150:8400

Are these settings correct?
Is this possibly a router configuration problem, or maybe a networking configuration problem on the machines themselves?

Any advice or suggestions would be most welcome.