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Outlook2010 constantly asks for user credentials for Exchange server (SBS)

Last Modified: 2012-02-27
I have a small network with a Microsoft Small Business server 2008 standard (not Hyper-V)
I only have 6 PC's two running Windows XP Pro 32bit.
All running Office 2010.

My problem is that on all the pc's Outlook kinda disconnects from Exchange asking for user credentials. When given it works fine for maybe 30 minutes and the asks again.

I can confirm, that the PC is logging on to the domain with same user as set up in Outlook.
I also have tried to rejoin the domain but this did not helped.

I have also tried setting up a new profile in Outlook 2010 but the problem persists!!

Any suggestions? :-)
Watch Question

Are you using outlook anywhere, if so try to uncheck these

On fast networks, connect using HTTP fist, then connect using TCP/IP and
On slow networks, connect using HTTP fist, then connect using TCP/IP

you cant find this in outlook account settings --> change --> more settings --> connection --> exchange proxy settings.


Well a good input but Im not using Outlook Anywhere so... :-)

Please take a look at this link provides similar symptoms:



Abbas HaidarSenior Infrastructure Manager

what about your secure certificate setup? do you have self signed or third party one?


I have found the article on social.technet.microsoft my self and found this useless.
I have tried to remove the PROTECT folder but without any impact.

The certificate is just a self signed.  My customer is not using and smartphones or remote desktops for access to Outlook.

Do you have wlan and cable connection ?
if laptop is fist connecting to wlan and somehow disconnect from there it will start using lan, then it will ask password for outlook.
if thats the case you can try to fist disable wlan and check is it still disconnecting after 30 mins
afterwards you can set network priority from network tap to fist connect lan if its possible.
Abbas HaidarSenior Infrastructure Manager

have you tried to install the certificate on the client machines as administrator?


First of all I would like to thank all your guys for the inputs - REALLY appreciate it!!

This is desktop computers on wired lan.

I have not installed any certificates since this customer is not connecting from the outside.
Abbas HaidarSenior Infrastructure Manager

if the computer is not a part of the domain, you still need to install the certificate!


Well as I put it in the mail question this pc is actually logging into the domain
This one is on us!
(Get your first solution completely free - no credit card required)


Hi Olaf :-)

OK now I have something to work with!!
I'll get back with a status in a day or two


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