Ah sorry i missed ur last post.

If the keys where changed the api user/password most likely aren't stored properly anymore.

Try and re-enter the credentials in the Smartermail service and try again.

Thanks for your help Marco,
It seems various IIS resets and recycles etc have fixed it.

I now have an issue with a remote MS SQL server, its simply coming back with:

System.Exception: Exception of type 'System.Exception' was thrown.

Is there anywhere I can see a true debug log for the calls?

Hmm usually the best information is the audit log under serveradmin.

The second best information is the SolidCP Server's Eventlog (in windows it self).

which should log warnings and errors of what it's trying to do.

There isn't much more then that (you can increase log level in the SolidCP Server web.config to 4, but usually it doesn't give much more info on the matter).

PS:

The remote SQL Server does it still have an SolidCP Server installed and configured? (same version as all the others).

I'm not getting "SolidCP Server’s Eventlog" I see the old Websitepanel log, but not the SolidCP one?

ok restarting event log loaded it:

[9/1/2016 11:11:24 PM] WARNING: System.Net.WebException: The remote server returned an error: (404) Not Found.