Looking at the logs in C:\Users\<myuser>\AppData\Roaming\SAP\CBTA\logs\CBTA.DefaultDomain.log i found out that there is a problem with logon, as I have to use a sap router string. This leads to sap note "2007184:SAP Router Support in CBTA" that requires an entry in saplogon for the cbta rfc destination. But it still does not work, so I need some more debugging time.
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