Overview


We have the following scenario:
All servers are installed with Windows Server 2008 R2 Service Pack 1. Lync Standard Server was configured with sip home.com.br domain and Active Directory domain is named fqdn home.intranet
 
Installing and configuring Edge Pool was conducted in accordance with the article: Instalação do Lync Edge Server em DMZ Double Hop (pt-BR) 

Symptom

After publishing the Edge Server in the structure Lync customers exhibit the error
 
Calling External Limit
 

The following message is displayed by clicking the error
 

Some calls to and from people outside of your corporate network may not connect due to server connectivity problems. Try singing out and singing back in. If this problem continues, please contact your support team. 

Cause

This error occurs when traffic MRAS is not permitted from the Front End server into the Edge Server internal network card.
Enabling logging on the Lync client can see the error line

 
And the log of the firewall that separates the Front End Server and Edge Server can see the connection fails
 

Solution

To solve this problem, create a firewall rule allowing the connection on port 5062/TCP originating from the Front End Server and Edge Server destination.
In this environment, we created a protocol in TMG 2010
MRAS Authentication
Port: 5062
Protocol: TCP
Direction: Inbound
 


And created an access rule between server roles
 

With the rule created in the user log out Lync client and log in again. The error should disappear.
 

And the firewall log should show a successful connection to the configured port.
 


 

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