John,
Did the email I sent you help? Typically this happens when the device goes into a deep sleep so the NIC stops responding. If the IPF 825 is not coming out of sleep mode try Print out the INF / Status prints then check the Netware > Frame Type setting (Sounds weird but try it). It should be enabled if the printer is not waking up from sleep mode when a print job is sent to it. Hope this helps
Vince