>>>Are you certain the server OS on site showing the error is XP and not Vista or Win7 ?
>>
>>I think I say "Often W 7 almost never XP"
>>I mean problem is usually W 7 rare/seldom XP
>
>question was intended to make sure it is not some variant of SMB2 errors, which only occur when client and server are newer than XP - which you specified under "network", which I interpret as "server OS", whereas "OS" I interpret as client OS.

Sorry, Thomas. But I had no option "Network" Windows 7. I wondered why but I had to make the question anyway.

When server and workstations are XP I seldom have this problem and I suspect they are always hardware errors.

Most of them are Server and workstations W 7.

I suppose I'll have to program a try catch sequence for giving time to server for answering or user for checking server.

I thank you very much.

Héctor