socket error # 11001 Host not found

[LUCA]

Good morning ,
I have a problem with the cobian program:
I have an internal network with no outlet to the outside where I should back up a folder on a NAS, but I have this error that repeats every time the backup starts.
How do I fix it?
Thank you

sorry but this is a translation of a message in italian

[cobian]

Host no found means exactly that. It could also be some firewall that is preventing the connection.