Josh - I think it might be offline because of several reason - this is assuming server and client are on the same local LAN:
- firewall filtering is blocking the inbound discovery from server on the Centos system
- server is not feeding the client the authkey necessary to allow communications between the 2 systems
Can you try running a urbackupclientctl command on the Centos machine to tell it where the server is, what port to communicate on and what the authkey is?
I’ve got 6 Centos 7 servers and about 40 centos or ubuntu clients (physical and virtual) talking to those servers with no real hiccups, other than firewalls getting in the way on local LAN sometimes.
If the client and server are not on the same local LAN, then generate the host in the server web console and copy/paste the code that is generated after clicking through setup. it would be something similiar to:
mktemp && wget “http://SERVER_NAME.fully.qualified.domain.name:PORT(usually 55414)/x?a=download_client&lang=en&clientid=2&authkey=SECRET_CODE&os=linux” -O $TF && sh $TF; rm $TF