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Kerio Personal Firewall 4
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+Web Filtering enabled problem
If a URL contains  (%13%12%13) Kerio Firewall Crashes

http://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=&btn G=Google
+Search

also it can be passed to a browser via IFRAME tag and crash Kerio
without user's acceptance
(many ways to do that with redirection)

To avoid this problem you shoud disable Web Filtering
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Internet Explorer 6
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if you create a web page and you add an IFRAME which points to --> ?
IE 6.0 Crashes.