Problem: S4 Connector Stuck on SPN Lookup During univention-join

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Problem
A customer reported several issues with the S4 connector:

  1. Group policies are not being synchronized.
  2. Computer accounts are not created correctly.
  3. The univention-join process enters an infinite loop, repeatedly logging messages such as:
Object created: uid=dns-abc-01,cn=users,dc=domain,dc=de
looking for spn account "dns-abc-01" in local samba
looking for spn account "dns-abc-01" in local samba
looking for spn account "dns-abc-01" in local samba
...

Root Cause
During analysis of the connector-s4.log, the tracebacks related to the object dns-abc-01 indicated that the connector was failing due to the attribute univentionOperatingSystem. This attribute caused the join process to stall and triggered the repeated lookup attempts in the local Samba environment.

Solution
The problematic attribute univentionOperatingSystem was removed from the affected object. After this adjustment, the join script was executed again. The process completed successfully, the infinite loop in join.log stopped, and the S4 connector resumed normal operation.

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