Thanks for all your suggestions. 2 of the machines that were constantly trying to go out on Port 9100 had old Print Jobs in the queue that were trying to hit a DMZ address for some reason (Jobs were deleted).
A few other machines we just re-imaged which is quicker than spending all day trying...
There are 4 different PC's in our internal network that are continuously hitting various external IPs on Various Ports according to the Firewall logs. We have scanned these PC's using Spybot, Malwarebytes and our anti-virus Trend Micro but they came up clean.
Any Suggestions?
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