Microsoft has issued a formal fix for a problem in Windows XP Service Pack 2 that appeared almost immediately after the update’s release.
The problem, which affected many VPN users, causes errors when programs attempt to connect to loop-back addresses other than 127.0.0.1. Service Pack 2 blocks all such addresses; users receive an error message saying that they cannot establish a connection. Microsoft had issued a hotfix for the problem last month, but the new update is more thoroughly tested and available to all without having to go through Microsoft Product Support Services.
Source: eWeek
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