Basic authentication
If you want to use Basic authentication, you must continue to type your user account credentials. There is no way for the client to submit your user name and password automatically. If you want to log on automatically, you must configure your Outlook profile to use NLTM authentication to your proxy server for Exchange.
If you want to use Basic authentication, you must continue to type your user account credentials. There is no way for the client to submit your user name and password automatically. If you want to log on automatically, you must configure your Outlook profile to use NLTM authentication to your proxy server for Exchange.
Before you switch to using NTLM authentication, you must verify with your administrator that NTLM authentication is permitted or even possible in your environment. Many firewalls and proxy servers will prevent successful NLTM authentication, whereas Basic authentication will work successfully. See the More Information section for additional details.
Note The authentication mechanism that you configure in Outlook is used only for the HTTP session to your proxy server for Exchange. The actual authentication between Outlook and your Exchange server always uses NTLM. See the More Information section for additional details.
To change the authentication mechanism on the Outlook client to NTLM, follow these steps:
Start Outlook 2003.
On the Tools menu, click E-mail Accounts.
Click View or change existing e-mail accounts, and then click Next.
Under Outlook processes e-mail for these accounts in the following order, click Microsoft Exchange Server, and then click Change.
On the Exchange Server Settings page, click More Settings.
Click the Connection tab.
Click Exchange Proxy Settings.
Under Proxy authentication settings, click NTLM Authentication in the Use this authentication when connecting to my proxy server for Exchange list.
Click OK two times.
Click OK again in response to the prompt that you must restart Outlook for the changes to take effect.
Click Next, and then click Finish.
Restart Outlook.
NTLM authentication
If your account is configured to use NTLM authentication and you are still prompted for your user name and password when you are logged on as the Windows account that has access to your Exchange mailbox, you must set the LmCompatibilityLevel on your client to a value of 2 or 3. To do this, follow these steps.
Start Outlook 2003.
On the Tools menu, click E-mail Accounts.
Click View or change existing e-mail accounts, and then click Next.
Under Outlook processes e-mail for these accounts in the following order, click Microsoft Exchange Server, and then click Change.
On the Exchange Server Settings page, click More Settings.
Click the Connection tab.
Click Exchange Proxy Settings.
Under Proxy authentication settings, click NTLM Authentication in the Use this authentication when connecting to my proxy server for Exchange list.
Click OK two times.
Click OK again in response to the prompt that you must restart Outlook for the changes to take effect.
Click Next, and then click Finish.
Restart Outlook.
NTLM authentication
If your account is configured to use NTLM authentication and you are still prompted for your user name and password when you are logged on as the Windows account that has access to your Exchange mailbox, you must set the LmCompatibilityLevel on your client to a value of 2 or 3. To do this, follow these steps.
Click Start, click Run, type regedit in the Open box, and then press ENTER.
Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\
In the right pane, double-click lmcompatibilitylevel.
In the Value data box, type a value of 2 or 3 that is appropriate for your environment, and then click OK.
Quit Registry Editor.
Restart your computer.
Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\
In the right pane, double-click lmcompatibilitylevel.
In the Value data box, type a value of 2 or 3 that is appropriate for your environment, and then click OK.
Quit Registry Editor.
Restart your computer.
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