XFOR: Err Msg: Cannot Open, HTTP/1.0 500 Server Error

• Microsoft Exchange Server version 5.0

SYMPTOMS

When you use an Internet browser to log on to Microsoft Exchange Server, you are prompted to enter your user name and password. When you type the correct name and password, one of the following two error messages may appear:

   Cannot open http://<server_name>/exchange/logon.asp

   HTTP/1.0 500 Server Error (Not enough storage is available to process
   this command.)

CAUSE

The first error message appears when only the basic (clear text) password authentication is being used, or when all three authentication methods (basic, anonymous, and Windows NT challenge/Response) are in use. Using all three is the default.

The second error message appears if both anonymous, or Windows NT challenge/response authentication, or both are being used without basic authentication.

RESOLUTION

To resolve this problem:

• Check the security permissions on the file Exchsrvr\Bin\Amhtml.dll and verify that the group Everyone has a minimum access level of Read.

  To assign full control (or any other combination of rights) to the group Everyone:

• In Windows Explorer, right-click the Exchsrvr directory and click Properties, and then click Security, and then click Permissions.