Exchange Edge server

I have a Exchange 2010 with all roles apart from the Edge role.   I am in the process of installing a an edge role server, in testing I could not connect to the LDAP services.  I understood all ports were opened, but in the production environment were I ran the test I am now told that 50636 would be blocked by the cisco router.  

 This has put some doubt in my mind and noticed that the only that the only roles installed on the current Exchange server are file server and IIS.  My question is do I need any additional roles\features installing or is it purely down to the blocked port
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Manikandan NarayanswamySecurity Specialist & IBM Security GuardiumCommented:

You don't need to install any other roles or Features this is purely related to blocked port which you have to unblock it from the Network side


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Windows Server 2008

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