Seems like there are some wininet issues with the latest schannel update for Windows XP. If you’ve got an older web server that is not compliant with IETF RFC 5746, and you use applications that connect to that old web server via wininet (like WCF apps, IE, etc), you are going to have issues. Microsoft has posted KB 2384778 on how to work around this, so I thought I’d save some people some time if they start seeing this.
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I’ve stumbled across a rather odd issue where users were starting to complain that all of the sudden they were running a previous version of IE again, even though IE8 had been installed previously in the environment. Also, they were complaining that when starting IE, it would simply close right after the UI was displayed. In troubleshooting the issue, we went back and looked at the IE8*.log files and found out that IE8’s setup had been run twice on these machines for some reason (still haven’t figured out why yet – that’s for another day), and had uninstalled IE8 during the second run of the installer!
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Internet Explorer 8 uninstalls itself if setup is run a second time?
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Had to work on one of these for a client, and decided that while there’s a whole host of documentation out there, there aren’t a lot of good working examples of how to use the proxy auto config functions properly in a complex file.
Since I spent the better part of 8 hours getting something that works properly in the environment (including site blocking to a custom server), I figured I’d share it with the users of this series of tubes in the hope it helps someone.