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Weirdest User Agent String (Updated)

24 Aug

>Investigating a reported bug with one of our PensioenPage websites (IE 8 being detected as IE6) I found out the cause of the issue: An IE8 instance returning the following user agent string:

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; SIMBAR={B81922DF-CABA-4976-8A80-B27BE01CAC7C}; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; Creative ZENcast v2.01.01)

Note that there’s both MSIE 8.0 and MSIE 6.0 in the string! This is the weirdest user agent string I’ve ever seen.

Update (August 25, 2009): And I’m not the only one seeing this kind of agent strings, I just noticed a FancyBox mailing list posting with a similar one:

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; .NET CLR 2.0.50727; InfoPath.2)

And if you search for “Trident/4.0; Mozilla/4.0 (compatible; MSIE 6.0;” on Google, you can find a lot of similar ones. It’s a strange world.

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