"File not found on server" error with ERA and clients

I have a machine that has been working fine for almost 3 years, WHS original box.
About a week ago the clients stopped updating from the server with the error "File not found on server"
I've checked all the settings in the ERA console and it all looks good.
I've also uninstalled what was a pretty old version and downloaded and installed the latest ERA Server and Console and setup the updates mirror again.
I've also updated the clients to the latest NOD32 and the update issue is still there.

What else could be going on?

 

Do the clients update fine from ESET's update servers and the problem is only with updating from the mirror?

 

Yes the problem is only with the mirror, changing the update settings on the server to get the updates direct from Eset worked fine.

 

Please compress the content of the following folders, upload them to a safe location and PM me the download link:
- mirror folder on the server
- C:\ProgramData\ESET\ESET Endpoint Antivirus\Updfiles
- *.dat files from the ESET install folder

 

Has this issue been resolved as I have the same issue for one of my servers. It also happens to File Security on the same server with Remote Administrator. Work for several years prior.