Problem:
R1soft server is unable to connect to Agent server, and giving following error message.
Failed to connect to (Server hostname) after 120000 milliseconds

Cause:
The R1soft backup server IP has been blocked at Agent server firewall. If you have CSF firewall installed, then its blocked by CSF firewall.

Solution:
Remove R1soft server IP from blocked IP list. It may be temporary blocked or listed in csf.deny