Personally if there were no baan changes, or changes on the servers - then I would get the network group involved and tracing thru the switch and out to the printer. To me it is obvious they changed something - be it DNS or the switch itself that caused the issue.
What about a simple windows print not involving baan at all? What about pings to print severs or printers?
My latest mantra - make sure you have latest stpapi patches and the latest session object. If on LN then please explore the option of using DAL2 functionality.
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