Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.
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|Exchange Server 2013 Message Tracking log Powershell ?||11||81|
|Exchange Server Send connector and DNS Round Robin ?||6||43|
|The sign-in method you're trying to use isn't allowed. for more info, contact your network administrator and Can't logon because the logon method you are using is not allowed on this computer||2||22|