AD connection works in windows app, but not in asp.net

[mconnolly]

Hi there,

This is probably down to something childishly simple that Im missing...

Im trying to get user information out of active directory. The code works perfectly well in a windows application running on my machine, but when I try to run it from asp.net I get the following error:
"The specified domain either does not exist or could not be contacted"

Dim root As New DirectoryEntry("LDAP://DC=domain1,DC=domain2,DC=com", "myusername", "mypassword")
Dim searcher As New DirectorySearcher(root)
With searcher
   .PropertiesToLoad.Add("cn")
   .PropertiesToLoad.Add("mail")
   .PropertiesToLoad.Add("givenName")
   .PropertiesToLoad.Add("sn")
   .PropertiesToLoad.Add("userPrincipalName")
   .Filter = "(&(objectClass=user))"
End With
Dim queryresults As SearchResultCollection = searcher.FindAll()
Dim result As SearchResult
Dim s As String
For Each result In queryresults
   If Not result.Properties("givenName") Is Nothing Then
      s = result.Properties("givenName")(0)
      s += " "
   End If
   If Not result.Properties("sn") Is Nothing Then
      s += result.Properties("sn")(0)
   End If
   If Not result.Properties("userPrincipalName") Is Nothing Then
      mylist.Items.Add(s)
   End If
Next

Can anyone tell me what Im doing wrong?