Hi Emanuele. I'm sorry for the long reply.
Glad to hear that the machine was easily restored to Azure. However, the issue you are facing is most probably related to some settings in MS Azure. This topic may contain a solution for your case: https://learn.microsoft.com/en-us/answers/questions/825482/in-a-azure-vm-the-number-of-connections-to-this-co . Please let us know if this helps, or if you need some additional assistance with your virtual machine.

Hello. Unfortunately, we need to have the logs from this backup agent, so we can investigate the reasons for this error. Probably there is some problem with permissions, but to provide you the correct information, we need to see the logs and some additional information from the computer. Can you please click on the 'feedback' button in the agent to create the support ticket? You can also create a support ticket by following this link: support.msp360.com.