> > you say "when the user doesn't work with it for a while"
> > does this mean one user only or all users?
> > if you mean the former then I would accuse that user's NIC as the likely
> > problem. if you mean all users start the problem, then I would
> suspect the
> > server's NIC.
> >
> > Alan
> >
> Hi,
>
> thanks for your reply, but if it's NIC (network interface card), is there
> any solution without buying the new network interface cards and replacing
> them?
> When I wrote "user" I meant any user.
>
> Elena

AFAIK you can't repair NICs - throw them away if they prove faulty.
But if you have this error on all connections it's unlikely to be all NICs.
Is there a router all these machines go thru? It's a LAN right? message
21156 provides my most difficult 10054 error.
bottom line is that 10054 means your connections are being broken by some
hardware somewhere. it may take some tracking down to find out exactly which
piece of hardware is might be.
Alan