Why does Outlook re-prompt user for login when already on account?

Tags:
Microsoft Outlook 2003
Password authentication
Why does a Microsoft Outlook 2003 client with 'Logon Network Security' set to 'Kerberos/NTLM Password Authentication' prompt a user for their username and password when opening Outlook? The user is already logged into their workstation with their domain account. But when the client is set to 'Password Authentication (NTLM),' it does not re-prompt the user for a username and password.

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Sounds like possibly the Outlook client is connecting with <i>RPC over HTTP</i> rather than a straight RPC connection, since the setting you mentioned is the default.

To check, look here:

If Outlook is open, from the File menu choose Exit.
Click Start and then Control Panel.
If Control Panel is in Category view, click the Switch to Classic View link on the left
and then double-click the Mail control panel.
If Control Panel is in Classic view, double-click the Mail control panel.
Click E-mail Accounts. The View or change existing e-mail accounts radio button should be selected. Click Next.
The Microsoft Exchange Server should be selected. Click Change.
Click the More Settings… button. Click the Connection tab.
In the Exchange over the Internet section (at the bottom), check that “Connect to my Exchange mailbox using HTTP is NOT checked.

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  • Technochic
    Also check the security tab in the same location jlees describes and make sure "Always prompt for logon credentials" is not checked.
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