Hi, I have some calls from users saying that their proxy server address has changed from "msstd:*.yourdomain.com" to "msstd:yourdomain.com" in Outlook 2007 with Exchange 2007. That is strange.. Does anyone have any idea? Thank you.

This is becaus of Autodiscover. The proxy server address is set in Exchange 2007 and distributed to the connecting Outlook 2007 clients using autodiscover. Even if you change the value in Outlook it will automaticly change back next time autodiscover kicks in. Im guessing that you are using a wildcard certificate and get a certificate warning? The proxy server address setting in Exchange 2007 can be changed running the following command for each Client Access Server: Set-OutlookProvider EXPR -Server <CASServer> -CertPrincipalName "msstd:*.yourdomain.com" This will set the Mutual Authentication to the correct value. Give that a try and let us know if it doesn't solve your problem.Martin Sundstrm | Microsoft Certified Trainer | MCITP: Enterprise Messaging Administrator 2007/2010 | http://msundis.wordpress.com

Hi Martin, When I type Get-OutlookProvider in EMC I got this. Do I suppose to get *.yourdomain.com or msstd:*.yourdomain.com? Name Server CertPrincipalName TTL ---- ------ ----------------- --- EXCH 1 EXPR *.yourdomain.com 1 WEB 1

Have you a a SAN certificate in exchange for this URL? Please create a new certificate that match the name of this URL. Test Outlook Anywhere Connectivity http://technet.microsoft.com/en-us/library/ee633453.aspx

You are supposed to get msstd:*.yourdomain.com Martin Sundström | Microsoft Certified Trainer | MCITP: Enterprise Messaging Administrator 2007/2010 | http://msundis.wordpress.com

No Mike, I have a wildcard cert.

Thank you Martin and I also find this confirmation from Microsoft : http://technet.microsoft.com/en-us/library/cc535023(EXCHG.80).aspx Another question: 1- If I want to test the prob, how could force the the autodiscover and see the change happened? 2- When the autodiscover is running? 3- Last one: What MSSTD means?

1. Yes, you can use Outlook to Test E-Mail Autoconfiguration. If you hold CTRL and click on the Outlook Icon in the right corner you will have the option to perform this test. Enter your credentials and then click test, this will give you a good report of the process. Or you can test your configuration using www.testexchangeconnectivity.com. 2. Autodiscover is a quite large component in Exchange 2010, I suggest that you read the following white paper from Microsoft: http://technet.microsoft.com/en-us/library/bb332063(EXCHG.80).aspx 3. Good question, I have never thought about that myself :)Martin Sundstrm | Microsoft Certified Trainer | MCITP: Enterprise Messaging Administrator 2007/2010 | http://msundis.wordpress.com

Hi Martin, Ya for the last question me too I never keep time to check what msstd stand for anyway. Thank you again for your help.

No problem, If I find it out I will let you know :)Martin Sundstrm | Microsoft Certified Trainer | MCITP: Enterprise Messaging Administrator 2007/2010 | http://msundis.wordpress.com