If no data available or error in Port Connectivity table in Microsoft Dynamics CRM / 365 (On-Premise) monitor, follow the below steps for troubleshooting:
Open powershell in administrator mode in the Applications Manager-installed machine.
Go to <Applications Manager Home>\working\conf\application\scripts\powershell directory.
Run the below commands by replacing hostname with that of the reported CRM server

Copy the output of the above command to a text file.