It appears that HP is not going to address this issue. So you have choices to make. Did you need a little push?
OfficeJet pro 8600, Networked to multiple windows XP computers.
I have 4 different OfficeJet Pro 8600's installed in 4 different locations, bought from different vendors. In every case I get the same problem.
This is a Networking issue. All printers are wired to the network.
The printer is not the cause of the problem. The problem persists even if the printer is off.
The problem is that: When computer is left on overnight, the next morning, webpages can not be accessed, and the network communication with the printer is gone. You can not print and you can not browse.
You can ping the router, ping outside DNS servers, and you can ping Webpages. Only browsing is affected. And printing.
Turning off the printer and restarting doesn't affect the problem. Rebooting the computer does solve the problem.
Killing all iexplorer services running in the task manager solves the problem.
HP support says this is an XP problem and they have no intension of working on the problem. They think it is a problem with network disconnect after 2 hours. They are wrong. I have left the computer alone for over 4 hours and the problem didn't arise. It only happens if you leave the computer on over night.
Windows XP computers have all been updated to latest updates and are running SP3.