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outlook 2010 authentication issue with Exchange 2003 through VPN connection

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.
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KOP2010
Asked:
KOP2010
1 Solution
 
sugunakarCommented:
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


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jimmithakkarCommented:
HI

follow step

Account Settings>
Change>More Settings>
Security>
Change "Negotiate Authentication" to "Password Authentication(NTLM)".
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KOP2010Author Commented:
no comment
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