Exchange 2007 - using NTLM and Basic authentication across RPC/HTTP
Posted on 2013-06-01
Here's my environment:
Outlook 2007 and 2003
Outlook clients are offsite, and onsite.
Problem: offsite computers who attempt to use NTLM as authentication method using outlook over HTTP are continually prompted for the password, and the server doesn't accept any attempts at entering the password, despite using different conventions (user@domain, domain\user) it just won't accept a password while ntlm is used as the auth method. If basic is selected, all is well.
In the exchange 2007 system manager, under the outlook anyhere section, the authentication method selected is BASIC. It appears it's an either/or selection, as I can't pick them both. It is a radio box choice, rather than checkboxes for multi-select.
Question: Can I run basic and ntlm on the same exchange 2007 server? I am able to select NTLM on the PC's that are on the internal network. That seems to work, but those who are offsite and need access over HTTPS are unsuccessful. I can't really just switch it to NTLM if the folks using basic will experience issues because I have many users configured to use their outlook in basic auth mode, and they would all experience down time if I reconfigure for NTLM (assuming it's either / or, and would kill the basic auth method).
I would like NTLM to work over HTTPS if possible, because I have some folks using outlook 2003 with XP and they want to be able to save their password. Outlook 2003 won't save passwords in basic mode, only NTLM - and if someone knows a way I can make it save passwords in basic auth mode, please let me know.
Help is appreciated! Thanks!