Try on backup client add a server IP in hosts table
Other reference
Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Veeam\Veeam EndPoint Backup
https://www.veeam.com/kb2335
https://gist.github.com/vertigra/cb4d802cfe3548d9c92b9e2d87b25d66
Remark at 29/7/2022
最近發現可能因為Fortigate關係, 於兩邊hosts table增加內網IP就解決
