One of our customers reported this error, sometimes backup plans run normally and others do not

MSP360 Backup
1

Hi
how are you guys?
Can someone help me?
This is the error when I try to backup
“The underlying connection was closed”

Thanks for help

2

[reply=“matheus;d984”] Hi Matheus,

My guess would be that antivirus or a firewall is preventing the agent from working properly.
Or in rare cases, it could be IPS (intrusion prevention system that decrypts SSL, inspects it and re-encrypts it on the fly).
Here’s what has to be reachable by the agent:
https://kb.cloudberrylab.com/managed-backup-service/mbs-tcp-ports-configuration