I finally found an answer!

http://www.theserverside.net/article...Authentication
web.config
Code:
<location path="dataentry">
  <system.web>
    <authorization>
      <deny users="?" />
      <allow users="*" />
    </authorization>
  </system.web>
</location>
<location>
  <system.web>
    <authentication mode="Forms" >
      <forms
        name=".opsreport" 
        loginUrl="logon.aspx" 
        protection="All"
        slidingExpiration="true" 
        timeout = "10"
      />
    </authentication>
    <authorization>
      <allow users="?" />
    </authorization>
...