Outlook connecting to Exchange 2010 error - The action cannot be completed. The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.

On a new Exchange 2010, I am able to connect from OWA but unabale to setup the Outlook profile. Getting the error

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


Ports 80 and 443 are open.
What are the additional port to be open so Outlook can successfully connect to Exchange?

What about the ports below are they required?

* TCP End Point Mapper (TCP/135)
* Dynamic RPC port range (6005-59530)
* 389/TCP/UDP (LDAP), 3268/TCP (LDAP GC), 88/TCP/UDP (Kerberos), 53/TCP/UDP (DNS),
artcrestAsked:
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big_daddy0690Commented:
I would suggest configuring static RPC ports on your CAS server. You will find detailed information on this procedure here as well as a script to automate the change for you.

The required ports with dynamic RPC ports:

TCP/135 - RPC Endpoint Mapper
TCP/443 - Autodiscover, Availability, Offline Address Book
TCP/6005-59530 - RPC Client Access Service, Address Book Service

The required ports with suggested static RPC ports:

TCP/135 - RPC Endpoint Mapper
TCP/443 - Autodiscover, Availability, Offline Address Book
TCP/59531 - RPC Client Access Service
TCP/59532 - Address Book Service
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Simon Butler (Sembee)ConsultantCommented:
Are you talking about ports from the internet or locally?
There should be no reason to open ports on the Windows firewall for Exchange to work correctly. Exchange uses dynamic ports by default.

Externally, on the internet, you will use Outlook Anywhere to connect. That goes over port 443 only, but will require the correct implementation of SSL certificates and DNS records to work.

Simon.
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