Outlook 2010 RPC over HTTP to Exchange 2003 users remain disconnected after login

Greetings Guys,
I am unable to find a solution, Windows 2003 DC, Exchange 2003, all user were working great, RPC over HTTP, until Tuesday at about the same time perhaps before the MS update KB3002657
all remote users using outlook 2010 did not have authentication popups as was noted from this KB. But instead all login successfully, ( looking at the security logs in the exchange) , but all are remaining disconnected, immediately after login.
The users had already been configured with the registry DefConnectOpts RPC key, so I doubt their Outlook profiles are the problem.
I suspect the DC's ( we have 2 ) or the exchange have picked up an issue. I am out of ideas.
Any help would be awesome
Barry

Hi,
According to your description, I understand that Outlook(Outlook Anywhere) client display disconnected after install MS update KB3002657.
If I misunderstand your concern, please do not hesitate to let me know.
KB3002657 is a security update to prevent attacker logging on to a domain-joined system and being able to monitor network traffic. More details about this update, please refer to:
https://technet.microsoft.com/library/security/ms15-027
For your question, please try to reconfigure a Outlook profile for testing.
If it works, you can try to below steps to pop sign in page in Outlook client:
1. Open Outlook---> File and click “Account setting”, then select account name and click “Change”.
2. Click “More settings”, switch “Security” and check “Always Prompt for logon credentials”。
3. Restart Outlook to login your account.
Once this done, you can uncheck this setting for convenience.
Besides, I find an similar thread about your question, for your reference:
https://social.technet.microsoft.com/Forums/exchange/en-US/7199811f-ee41-4b81-aafe-698bdb5a0b49/recently-outlook-cannot-auth-username-and-password?forum=exchangesvrclients
Thanks
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]
Allen Wang
TechNet Community Support

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HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeSA\Parameters
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<Resource for reference>
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Your Novell Product Support Forums Team
http://support.novell.com/forums/

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Outlook 2010 RPC over HTTP to Exchange 2003 users remain disconnected after login

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