hi, i've installed exchange 2010 with external certificate mail.mydomain.com and i configure rpc over https clients and it's all ok.But now i must configure another email domain (domainB.com) when clients rpc over https connect to exchange i have error name certificate because use mail.mydomain.com but i want use only one certificate for two-three email domain. What can i change?thank you very much!

The error is probably coming from autodiscover. The clients take the primary email address, and try to use autodiscover.example.com (where example.com is the primary email domain). You have three options. 1. A new certificate that covers autodiscover.<domain> for each domain that you are supporting. 2. Use SRV records for each domain - if your external DNS provider supports it. 3. Use redirection for autodiscover on the public web site. All of those options are in Technet. The Outlook Anywhere host name can remain as the common name on your SSL certificate. The fact that the users are connecting to mail.example.com but their email address is example.co.uk wouldn't matter. Simon.Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me.

hi, thanks for reply. 3. i modify autodiscover.domainB.com in the dns to point on the autodiscover.mydomain.com but nothing change

You can't just change the DNS. The client will be connecting to https://autodiscover.example.com - if that isn't one of the names in the SSL certificate then you will get the prompt. Simon.Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me.

Where can i found information? i must resolve this problem,thank you

Technet. The way that autodiscover works is all documented in the Exchange documentation on Technet. Is Google/Bing broken? Simon.Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me.