Unable to register new displays - Client found response content type of 'text/plain;charset=UTF-8', but expected 'text/xml'

[BSchumacher]

Good day,

Not sure what changed, but I was able to register a new display when I originally setup the CMS a month ago, today we were going to transition to the new server and we are unable to register any new displays, they give the error below.

CMS Version

2.3.5

Player Version

2 R254.1

Issue

Unable to register new displays client gives error

Status
Client found response content type of 'text/plain;charset=UTF-8', but expected 'text/xml'.
The request failed with the error message:
--
There has been an unknown error with XMDS, it has been logged. Please contact your administrator.
--.

This is a custom install on IIS 10 with PHP Version 7.4.8, corporate won’t allow me to use docker. The CMS log doesn’t list anything.

The report fault shows all is fine except “ZeroMQ”, but that didn’t stop it from working last month.

I have found other threads about this issue, but none of them seemed to help. Any help would be greatly appreciated.

[BSchumacher]

As a test, is there a way to manually add a display to the system via the tables and local files?

The one that is there is working and if I copy the local library files to another machine it will connect (and take over that device), but if they can be added manually for now.