The suivant should work, depending on votre IIS version. You'll need to ajoutez un web.config si you ne have one (though you should on IIS7) in le directory root of votre site. The ci-dessous will allow Domain Admins et deny Domain Users (fairly self explanatory). Make sure you line up le config sections si you déjà have a section, etc.
<configuration>
<location path="MyPage.aspx/php/html">
<system.web>
<authorization>
<allow users="DOMAIN\Domain Admins"/>
<deny users="DOMAIN\Domain Users"/>
</authorization>
</system.web>
</location>
</configuration>
Vous allez need Windows Authentication enabled under Authentication in votre site preferences for this to work, obviously, mais I assume you déjà have this enabled.
