Is your hostname / IP set correctly in whmcs server properties?

they need to correspond to how they can connect to enterprise.

also the ssl box is usually left unchecked unless enterprise is configured with an SSL certificate etc.

Hi Marco

Yes, the hostname is the same as the URL I used to access it via a browser (with the port added), and also the IP which I also confirmed via browser access with the port added.

There is no SSL cert so I have not clicked that option.

I also tried changing the hostname to the IP address to see if that helped (that is how my other linux server is configured, but it is the local machine that the WHMCS installation is on, whereas the SolidCP is obviously remote).

hmm,

Can you try making the hostname without the port just ip? (as it normally puts the port behind automatically)

For the portal url you can then override in the Product module options.

I tried that as well just like you said, but still won't connect. I have a feeling it is to do with the MS Server connection permission not accepting the connection. What permissions would I need to check to confirm this? I checked my error logs and there is no indication of a log in attempt.

the MS connection perms is mainly port 9001 / 9002

aslong as you can load those sites in the whmcs server the connectivity should be working correctly.

The only left other aspect is PHP Soap module on the whmcs server, this extension is required to make our module work.