Both Windows Firewall and the anti-virus firewall were enabled. (This is strange in itself: normally, an anti-virus program disables Windows Firewall.) Disabling Windows Firewall, rebooting, and reinstalling the printer software finally got the wireless printer working again.

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"Overcautious customers tend to disable Poproxy manually in the Task Manager (accessed by hitting Control-Alt-Delete in Windows), others get weary of the program and decide to block it when their personal firewall reports that Poproxy is trying to connect to the Internet, " said Van der Grift.

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