The action cannot be completed. The Connection to Microsoft Exchange is unavailable. outlook must be online or connected to complete this action

I've been struggling with this for days. I have Exchange 2010 SP1 with roll up 2 on a server 2008 R2. The server is in a data center and I cannot get Outlook Anywhere to work with Outlook 2010. I am putting mail.mydomain.com, select connect using http on fast and slow networks, and basic authentication. I have entered the registry key to disable IPv6 and removed the thing from the hosts file. This is driving me absolutely insane but I can't tell my boss that he can't use Outlook from his house...

Everything passes on testexchangeconnectivity except 1 warning:

ExRCA can only validate the certificate chain using the Root Certificate Update functionality from Windows Update. Your certificate may not be trusted on Windows if the "Update Root Certificates" feature isn't enabled

This is a new server. The OS is Windows Server 2008 R2. The server is the domain controller and is the only server in the domain. It has Exchange 2010 SP1. All updates have been installed including update roll up 2. My certificate is from godaddy and is the one that allows 5 domain names. I have read through every article I can find and there is no answer to my problem. Do I need to call MS support?

jakubusAsked:
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Dan ArseneauCommented:
The Common Name of the certificate should match the msstd:mail.domain.com setting in Outlook. Does the GoDaddy cert have the common name set to what the ExternalURL of the CAS server is?

Get-ExchangeCertificate -Server aprdcasvm001 | ft Subject

The URL after CN= is your Common Name.

EMC - Microsoft Exchange On-Premises - Server Configuration - CAS SERVER properties - Outlook Anywhere tab - External host name.
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craig_j_LawrenceCommented:
From the workstation you are having issues with, connect to the OA URL with a web browser. do you get a certificate error?
usually, if everything else is configured correctly, it comes down to the certificate not being trusted. Make sure that you have downloaded the latest root certificate update on every machine.
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jakubusAuthor Commented:
I can connect to OWA just fine with no certificate errors. Also, my phone connected just fine with autodiscover and the autodiscover website is fine, no certificate errors there either.
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Dan ArseneauCommented:
In Outlook settings for Autodiscover, do you have the "Only connect to proxy servers that have this principal name in their certificate" selected?  If you remove the checkbox, can you connect?
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jakubusAuthor Commented:
I have tried with and without the "Only connect to proxy servers that have this principal name in their certificate". It won't connect either way.
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jakubusAuthor Commented:
You were correct that the External host name was not the same as the Common Name. I fixed that and restarted the server. The CN and External host are now the same. However, the problem is still the same.
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jakubusAuthor Commented:
Can anyone else help? I'm really close to just calling MLS support. I don't know what else to do. Thanks!
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jakubusAuthor Commented:
Anyone? Help?
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craig_j_LawrenceCommented:
hi jakubus

are you trying to use OA internally or externally? have you configured  / published the /rpc directory to the internet?

please review the following article. It provides a video walkthrough of the process to configure OA on Exchange 2010
http://www.netometer.com/video/tutorials/how-to-configure-outlook-anywhere-in-exchange-server-2010/

Thanks
Craig
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jakubusAuthor Commented:
Turns out that outlook autodiscover works but not manually. Thank you!
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