When I could no longer connect to my OMV server after upgrading to Windows 11, the client PC could apparently "see" the server on the network but gave a "can't connect" error every time I would try to browse the network to get to the files on the server or try to map a network drive to it. I tried every possible fix that I could find online without resolution until I came to one Youtube video that gave the fix that worked for me. This is what I did to fix the problem......
1.) I opened Power Shell on the Windows 11 client PC as administrator.
2.) I entered each of the below lines separately(hitting ENTER after each one) & then did a reboot afterwards for good measure. After doing that the client PC was able to connect to my OMV server! I fixed 3 PC's with that had this problem by using this method. After entering each line there will not be a success message or anything...just the DOS prompt again, but it DID work. You only need do this once & then the problem is fixed from then on, even after a reboot. Hope this helps someone facing the same issue. The lines are......
Set-SmbClientConfiguration -RequireSecuritySignature $false
Set-SmbClientConfiguration -EnableInsecureGuestLogons $true
