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Sorry to resurrect an old thread but no solution was yet posted for the OP's problem that I too am having exactly. Error code 255 is the key. I'm having this exact problem as well, exit code 255 (which is different from exit code 1 which is usually a timeout.) TASK ERROR: command '/bin/nc -l...

Okay, that's good, but does it continue to use root? And must all servers in a cluster be able to accept root logins from every other server in the cluster?

Hello. Does regular cluster communication require root logon between machines? I usually set 'PermitRootLogon' to 'no' in my sshd_config for safety. I set it to yes to add a cluster node, but can I turn it back off now? If it must be on, does it use keys for authentication? I usually also set...

Hello. I run a Kerberos realm for single sign-on and wanted to know if it's possible to configure Proxmox to allow a Kerberos user to log in to the Web interface with admin rights to the Proxmox machine/cluster? I tried using Active Directory and just put in the Kerberos details...