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I have Exchange installed and the certificate verified.

On a computer in Network I can send out emails but can not receive them.

On a computer outside the network I am not send or receive.

When I attempt to go https://mail.advsystems.com/owa/

I am given the following error.

The Microsoft Exchange Active Directory Topology service on server localhost can't be contacted via RPC. Error 0x6D9.

  • This reads like a firewall issue. – Davidw Mar 25 at 0:54
  • We have no outisde firewall. Just Exchange, 2 Domain Controllers and a Gateway Server. – Michael Downey Mar 25 at 2:04
  • The Exchange Server's firewall is the one I meant. And honestly, you should have at minimum a firewall between the public internet and the LAN. – Davidw Mar 25 at 5:05
  • How do I configure the Exchange Firewall. Once I am getting mail my exchange account then I will look at external firewalls – Michael Downey Mar 25 at 6:34
  • @Davidw for testing I turned the firewall off. – Michael Downey Mar 25 at 7:00
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What’s your current Exchange version? How many users meet this issue?

Since you mentioned that can't send/receive messages on external network, make sure that you have enabled Outlook Anywhere.

https://social.technet.microsoft.com/Forums/exchange/en-US/7806a15e-7b8c-4ef5-86da-cf6a3503f74f/off-site-users-unable-to-connect-all-the-sudden-to-exchange-2010-enviroment?forum=exchangesvrclients

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