Hello @Chavele
What version of the server are you using?
Did you enabled debug mode on both client and server?
Do you have a front-end to serve requests to urbackup-server end-point?
Any firewall enabled on your vps?
You should also double check your DNS configuration if you try to reach server through a domain name.
If using beta version I recommend reading the following: Server 2.5.25/Client 2.5.19 (updated)
Go through the administration documentation again and double check that your configuration looks coherent. UrBackup - Server administration manual
Regards,