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Sounds like port 5003 is being blocked somewhere. It needs to be added as allowed in the host machine, and you might need to add port forwarding on your router to forward inbound port 5003 traffic to that machine.
Try using this to check port 5003 from the host machine:
Thanks Mike, I'll be speaking with the client again on Thursday so will try this then.
I couldn't see anything in the firewall that would allow me to enter port numbers to open as it would only allow me to choose an application in the Program Files folder and not select port numbers to open for that application.
I found an advanced area of the Windows 7 firewall which allows access to port configuration so I removed the fmsadmin, the scripting engine and fmserver from the firewall where they were declared as applications and opened the ports instead. The Windows Server firewalls I've worked with in the past just go straight into this advanced area.
I then found some separate security software that was overruling the built-in firewall so I've disabled that firewall and used the built-in firewall and it's now working.