DRS connection failed

UCS - Univention Corporate Server
,
#1

The systemmail mailbox is flooded with messages concerning DRS.

I could pinpoint it down to /usr/share/univention-monitoring-client/scripts/check_univention_samba_drs_failures and the messages are all the same:

('DRS connection to ucs-addc.secuinfra.com failed', drsException("DRS connection to ucs-addc.secuinfra.com failed: (3221226047, 'No service is operating at the destination port of the transport on the remote system.')"))
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/samba/drs_utils.py", line 60, in drsuapi_connect
    drsuapiBind = drsuapi.drsuapi(binding_string, lp, creds)
samba.NTSTATUSError: (3221226047, 'No service is operating at the destination port of the transport on the remote system.')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/samba/netcmd/drs.py", line 55, in drsuapi_connect
    (ctx.drsuapi, ctx.drsuapi_handle, ctx.bind_supported_extensions) = drs_utils.drsuapi_connect(ctx.server, ctx.lp, ctx.creds)
  File "/usr/lib/python3/dist-packages/samba/drs_utils.py", line 63, in drsuapi_connect
    raise drsException("DRS connection to %s failed: %s" % (server, e))
samba.drs_utils.drsException: drsException: DRS connection to ucs-addc.secuinfra.com failed: (3221226047, 'No service is operating at the destination port of the transport on the remote system.')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/share/univention-monitoring-client/scripts/check_univention_samba_drs_failures", line 78, in write_metrics
    consecutive_sync_failures = _CheckSambaDrsRepl().check()
  File "/usr/share/univention-monitoring-client/scripts/check_univention_samba_drs_failures", line 56, in check
    drsuapi_connect(self)
  File "/usr/lib/python3/dist-packages/samba/netcmd/drs.py", line 57, in drsuapi_connect
    raise CommandError("DRS connection to %s failed" % ctx.server, e)
samba.netcmd.CommandError: ('DRS connection to ucs-addc.secuinfra.com failed', drsException("DRS connection to ucs-addc.secuinfra.com failed: (3221226047, 'No service is operating at the destination port of the transport on the remote system.')"))

It’s the sole DC in the domain since the AD Takeover two years prior. Just today, I removed the hopefully last remnants of the prior Windows PDC. But before that, I changed every occurrence of PDC.secuinfra.com to ucs-addc.secuinfra.com.

Any hints what’s wrong?

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