SMTP Authentication Configuration on Windows XP Professional Edition


The Simple Mail Transfer Protocol (SMTP) service in Windows XP can be configured to require clients to authenticate before issuing mail commands. When you install or upgrade to Windows XP Professional in a workgroup, the NTLM (formerly called Microsoft Windows NT LAN Manager) and Generic Security Services API (GSSAPI) authentication options may not work.


NTLM and GSSAPI may not work if a registry key is set that forces guest-only authentication.


Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows

To work around this issue, set the force guest authentication registry key:

  1. Use Registry Editor to locate the following key in the registry:
  2. Double-click the ForceGuest value.
  3. In the Value Data box, type 0, and then click OK.

ID articol: 304707 - Ultima examinare: 23 oct. 2008 - Revizie: 1