https://www.icyphoenix.com/viewtopic.php?f=35&t=5852&p=39709#p39709
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Lopalong
Sun 24 May, 2009 15:42

Re: CBACK Error On Registration
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Nationality and language can also cause problems.

I recall there was a problem with a Polish person, where CTracker saw pl as a perl / cgi attack rather than a bonafide language prefix. :(