Opening ports for Exchange 2010 in firewall

Question

I have setup an Exchange 2010 SP2 server, which works absolutely fine.

However, sometimes the Outlook client won't connect. Looking with TCPView, I can see that it is trying to access ports that haven't been opened. The weird thing is, that it worked fine a few weeks earlier.

So, are there any dynamic port range that Exchange uses? I noticed the ports were something like 48031, 48103.

Solution

Depends how you're connecting to the Exchange.

http://technet.microsoft.com/en-us/library/bb331973%28EXCHG.140%29.aspx

Comments

[EEAA]

Those would be ports that the client is connecting from, not ports the client is connecting to.

[Frederik]

@ErikA Might be that you say so, but opening these ports in the firewall on the exchange site fixed any exchange/outlook related issues we had.

[Frederik]

I have already been all over that article, and opened more or less all of those ports. However, I cannot seem to find the ports specified in the original post: 48031,48103.

[Vick Vega]

Because they're not needed, because those are dynamic ports, next time you restart your Exchange server, it will change. Please describe the way how your users are connecting to the Exchange server.

[Frederik]

They start up their outlook, inserts their name, email and password, autodiscover figures the rest of the settings, and they got email.

[Vick Vega]

If this is the case, the only port you need is 443. (HTTPS) I would suggest validating all the settings are properly configured for Autodiscover. testexchangeconnectivity.com

[Frederik]

Using testexchangeconnectivity gives me all green lights - except for the RPC/HTTP test, which tells me that it gives 404 on rpcproxy.dll

[Frederik]

I figured out that the RPC over HTTP Proxy was the problem, as it wasn't installed at all. Now testexchangeconnectivity gives me all green lights :-)