asp.net The resource cannot be found. -

i created simple .net app test out error 404 (page not found). have config file follows.

   <httperrors>       <path="/pagenotfound.aspx" responsemode="executeurl" />    </httperrors> 

the pagenotfound.aspx exists. when entered fictitious page name, such default4.aspx, since not exist, expect redirect request pagenotfound.aspx, doesn't. i've set default page default.aspx, exist. once it's launched, change web page @ address bar default4.aspx. i'm getting error message below.

the resource cannot found. description: http 404. resource looking (or 1 of dependencies) have been removed, had name changed, or temporarily unavailable. please review following url , make sure spelled correctly.

requested url: /testwebapp/default4.aspx

version information: microsoft .net framework version:4.0.30319; asp.net version:4.0.30319.34248

any ideas, appreciated.