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3161589 - What went wrong: error checking credentials rejected


I am currently struggling with the setup of an on-premises connector to an S/4 HANA ERP system. 

The VM has already been connected, the connection is working.

The user login does not seem to work, error message results (The stored credentials seem to be invalid).

What went wrong
checking credentials: rejected. Reason:

{"message":"Exception caught, caused by: Max waiting time (20 secs) exceeded for [X-ProxyBridgeRequestId=0f0c955d-42c2-4926-a074-b94bd5b58d56],caused by: Max waiting time (20 secs) exceeded for [X-ProxyBridgeRequestId=0f0c955d-42c2-4926-a074-b94bd5b58d56]","status":500,"error":"Internal server error","timestamp":"xxxxxx"}


What could this error message be about? The information we have received from the customer to access their system:

SAP-Router-String: „/H/“
Client: 021
System number: 03



SAP Signavio Process Intelligence all versions


KBA , BPI-SIG-PI-DM , Data model / ETL for SAP Signavio Process Intelligence , How To

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