Hi Peter,
Check the server event logs, the whole ugly story will be detailed there. It should give the clients Techs all the info required to chase the error down.

>Hi Neil,
>
>Thank's a bunch!
>
>Yes, SP1 is installed.
>
>Yes, it's being run from a Citrix app server.
>
>Yes, they're using HP Printers.
>
>And finally, it could be a NIC or cable problem.
>
>I've passed the article on to the client, and will let their support people deal with it.
>
>BR
>
>Peter
>
>>Hi,
>>This may help http://www.rcms.net/support/support_errors_c0000005_c0000006.htm
>>
>>Also look for a flaky Network Cable/Fly lead.