url issue in my asp.net web application

i am getting a very strange and new issue.when i run my web application on localhost(i have not tested online),instead of this url
http://localhost:1171/mysite/Default.aspx
i am getting like this
http://localhost:1171/mysite/%28S%28wqoub2sahkucgt3prgnxnxra%29%29/Default.aspx
what i have missed?

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