I see this error on my backup and member server occasionally.
univention-join: joins a computer to an ucs domain
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Enter Primary Directory Node Account : Administrator
Enter Primary Directory Node Password:
Search Primary Directory Node: done
Check Primary Directory Node: done
Stop S4-Connector: done
Stop LDAP Server: done
Stop Samba Server: done
Search ldap/base done
Start LDAP Server: done
Search LDAP binddn done
Running pre-join hook(s): done
Join Computer Account:
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* Join failed! *
* Contact your system administrator *
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* Message: Please visit https://help.univention.com/t/8842 for common problems during the join and how to fix them -- IP address 10.10.3.4 is already assigned to cn=ucs-dispatch1,cn=dc,cn=computers,dc=adventure,dc=local, please remove that object or change the IP address.
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To fix I usually change or delete the ip addr of the offending server in the management console. It’s usually fixed upon successful join. This seems like a janky way to do things. Is there a better way?