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I get every 10 seconds the following sequence in the data collector log:

DPM reachable but returning '404' HTTP status on login        RemoteSSOService    

RemoteSSOService is not active, changing to disconnected mode        FailoverSSOService           

RemoteSSOService is active, changing to connected mode        FailoverSSOService

 

Most things seem to work. The engine (v5.3) is connected to Control Hub with a proper setup ( https://eu01.hub.streamsets.com/ ). 

As the URL is not logged (even in trace) I cannot see what could solve this. 

Does anyone have an idea what is happening here?

After debugging the traffic with -Djavax.net.debug=all the problem is following:
a call to https://telemetry.streamsets.com fails with “java.net.SocketException: Connection reset”

After that streamsets tries to go to https://eu01.hub.streamsets.com/security/login , which doesn’t exist.

This leads to above fatal cycle and meteringEvents.json in /data start to pile up.
Interestingly a curl to https://telemetry.streamsets.com in the same container works. And the error always happens.

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