Restrict access to a specific user for a page

I need to allow only one user access to a specific page in my project and have tried the following code snippet in the web.config to no avail  

1 <location path="OldThemeManager.aspx">
2 <system.web>
3 <authorization>
4 <allow users="test11"/>
5 <deny users="*"/>
6 </authorization>
7 </system.web>
8 </location>
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