Changing Powershell-connector gives 503 service unavailable on jobservers, but not on any other servers in the environment.

Hi . 

As the subject states. 
Going from Basic auth to the use of API-key in our connectors gives 503 Service unavailable. The code itself seems to work just fine directly in Powershell. However, showing the "services" page to that spesific service gives a blank page on our jobservers. On other servers we can open that service and also browse users in the connector. (via Sync editor). In fact we do the same operations on four different servers, 2 of them gives 503, the 2 other works perfect. They are in the same network-wise.

Any suggestions?