Initially appeared to be working. Client was discovered from the server (after giving server a hint, because of different subnet due to client being connected via OpenVPN TUN). Initial backup was initiated from server end manually, started up fine, but failed part way through due to lack of permissions on a symlink it was trying to follow. Corrected the client backup path so that it was defined with -f option so as not attempt to follow symlinks. Walked away for a few hours, planning to try another backup after having lunch.
Came back and attempted to manually start a second backup attempt. initiated this backup from the server end. Failed. Looked closer at server’s UrBackup “Status” screen and found server thinks client is offline. Attempted to manually start a backup from the client end, this failed too (client status shows not connected to a UrBackup server). Server host OS can ping client IP, client host OS can ping server IP, these two OS’es are talking to each other just fine. Restarted urbackupbackend on client, no change, client still appears offline to server.
Client: LinuxMint 18.1, compiled UrBackup client from source, latest client version (downloaded today)
Server: Raspbian Jesse on a Raspberry Pi3
Other clients work just fine, and installation on these other clients was done identically to the client that is not working.
What to do?