Hi Matthias,
From the traces file provided I could see that your issue happens because your client workstation did not get a ticket from the AD. Could you check if:
- You configure the SPN of your system account as server SNC Name in SAP GUI configuration and not the UPN.
- If the SPN exists in AD with the command "setspn -Q <your SPN> e.g. setspn -Q SAP/ABCD. This command should be made in your ADS
- If the SPN you configure in SAP GUI with @DOMAIN is the domain of your client workstation. You can use the command "klist" on your client workstation to check all kerberos ticket provided.
KR
Valerie