Outlook 2007 Clients being prompted to install a security certificate for secure.xxxxxxxxx.co.uk

Outlook 2007 Clients being prompted to install a security certificate for secure.xxxxxxxxx.co.uk every time they open Outlook
grovenetsupportAsked:
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Glen KnightCommented:
The other option is it may be looking for autodiscover.domainname.com and finding your ISP.

Can you try creating an autodiscover.domainname.co.uk (where domainname.co.uk is the part after the @ in your email address) as a forward lookup zone in your internal DNS.  And point it to the internal IP of your exchange server.  Setup the zone as per my guide here: http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_3703-Use-iPhone-on-wifi-network-without-the-need-to-reconfigure.html
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Glen KnightCommented:
Can you follow my guide here: http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2300-Outlook-continually-prompting-for-username-and-password.html

First make sure you have SP3 installed, then try the kernel mode authentication.

If that doesn't work, do you have a self signed or 3rd party certificate? The domain name, is this one you recognise? Is it your own?
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grovenetsupportAuthor Commented:
Yes it is and it never used to happen just started so not sure what installed on the server that created the problem. I have seen it before but cannot for the life of me remember what i did to fix it
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Glen KnightCommented:
Can you try my guide?
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