Upsource keeps reconnection

We installed upsource but when we want to access it true a IIS proxy it keeps reconnection

 

What it is calling is:

wss://upsource.url.nl/~socket.io/?EIO=3&transport=websocket

and that gets a:

Status Code:
101 Switching Protocols
 
We have the exact same proxy settings for youtrack and teamcity and they work perfectly.

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