outlook 2010 authentication issue with Exchange 2003 through VPN connection

Posted on 2011-10-13
Last Modified: 2012-05-12
I currently have an Exchange 2003 server and both outlook 2003 and outlook 2010 clients. I am not facing any issues on LAN. However, when connecting through VPN, Outlook 2010 clients cannot connect to the Exchange server. It keeps prompting for a username and password.
I have no issues with Outlook 2003 VPN clients.
ISA server is being used as a Firewall.
Question by:KOP2010
    LVL 3

    Accepted Solution

    Looks like an authentication issue. It might be resolved it by the following:
    Account Settings>Change>More Settings>Security>Change "Negotiate Authentication" to "Password Authentication(NTLM)".
    Should ask you to re-authenticate your domain credentials, and then you should be in. Hopefully this helps

    LVL 7

    Expert Comment


    follow step

    Account Settings>
    Change>More Settings>
    Change "Negotiate Authentication" to "Password Authentication(NTLM)".

    Author Closing Comment

    no comment

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