Can't communicate with Octopus server from Windows Server 2003 in DMZ

My windows server 2003 machine which is in the DMZ is showing as offline. The port I am using is open as Octopus server can communicate with a 2008 R2 machine which is also in the DMZ, using the same port.
Any suggestions?
Thanks in advance.

Hi Ann,

Thanks for getting in touch! Have you found our Tentacle troubleshooting guides?

It should hopefully take you through some steps to determine why Octopus cannot communicate with your Tentacle.

Let me know what you find!