after starting the SUM tool (with user root)
I'm able to access the URL and to login with <SID>adm. The system starts processing "Process Execution in progress" and after a while I get a popup
Here some more details:
I extracted the latest SUM.SAR file with user <SID>adm.
SAP ERP 6.0 EHP8
Suse SLES 15-2
SUM 2.0 (latest release)
SAPHostagent 7.21 PL 51
Thank you very much for your support!