We have a Windows XP SP3 computer that a coworker previously blocked outgoing internet activity on. Now we are trying to restore it, but the coworker can't seem to remember how he did it. Some amount of local connectivity remains, as it is able to reach our network attached storage and our point of sale program is able to connect to its SQL database. However, it is not able to connect to our local IM server (jabber protocol, I believe using port 5222) and it is not able to connect to the routers web interface (or any other http page). Through testing I've found that it is:
Not blocked locally through a firewall
Not blocked by any access controls in the switch or router that I can find
Not blocked locally by an IPSEC policy (or at least
netdiag.exe /test:ipsecstates that no ipsec policies are defined).
Not accomplished by redirecting using a proxy (or at least none are defined in internet options)
Not accomplished by altering the hosts file in
Not dependent on the local IP address
Seemingly not dependent on Mac address (or at least not resolved by moving the network cable to the other port; I suppose both addresses may be blocked somewhere)
Does anyone have any suggestions on how else internet activity may have been blocked?