Windows Server with Veeam Agen and Synology storage

Hello everyone,

The problem I have involves Windows Server (2012, 2016 and 2022), Veeam Agent for windows (6.2.1.121) and Synology storage DS723+ and/or DS1520+ (DSM 7.2.1-69057 Update 5).

I am backing up three servers. The first is 2012, the second is 2016 and the third is 2022. All of them can access storage and shared resources.

The backup software I use on both servers is Free Veeam Agent, and if, for target, I select the storage space mapped as disk F: for example, everything works flawlessly.

If, when creating a backup job or editing an existing one, I change the target from "local storage" to "shared folder", after clicking on "Browse" the following happens:

Server 2022 instantly finds and displays all SMB devices (without username and password) and after clicking on one of them, it asks for usr/pass to be able to access them.

If I select share on Synology storage and save the configuration, the next backup goes to share without any problems (THEREFORE THERE IS NO PROBLEM AND THIS IS HOW IT HAS TO WORK).

If I do all this on Server 2012 or 2016, clicking on "Browse" causes the following reaction: 

The "Select Share" window opens and it says:

"Loading devices...; Last error: the service has not been started" SMB1 - 3 is disabled on all servers, which I check with Powershell commands:

Get-SmbServerConfiguration |

Get-SmbServerConfiguration | Select EnableSMB1Protocol
EnableSMB1Protocol
------------------
True

Get-SmbServerConfiguration | Select EnableSMB2Protocol
EnableSMB2Protocol
------------------
True

On the storage, the lowest SMB level is SMB1 (I know it's not safe, but...) and the highest is SMB3.

If anyone has any ideas on how to fix this, I'd appreciate it

Regards