Wordpress is ignoring Unicode Chars in URL

permalinks, php, unicode, wordpress

Solution

For an overview of the problem, review:

http://ruslany.net/2010/03/important-update-for-iis-7-0-fastcgi-module/

this refers you to the now outdated:

http://ruslany.net/2010/02/fastcgi-module-differences-across-iis-versions/

My own situation was fixed by applying Win 7 SP1 but, interestingly, I was still left with applying the registry hack that is described in the Hotfix:

http://support.microsoft.com/kb/2277918

Problem

I am using wordpress with this type of permalink: /%year%/%monthnum%/%postname%/ if I use this type of url: example.com/2010/03/तकनीक it treats this url like this example.com/2010/03/ (By ignoring unicode chars) and displays March 2010 archive list. if I use english url: example.com/2010/03/technology then it works perfectly. This problem occurs even on tags page: for example example.com/tag/इंटरनेट is treated like example.com/tag/ and displays 404 page. Why wordpress is ignoring unicode chars? If I use default querystring structure then it works perfectly even with unicode characters. Server Info: IIS7 Win2008 Server (Url rewriting enabled) Wordpress 2.9.2

Original source