Applying configuration settings... Failed. The underlying connection was closed: the connection was closed unexpectedly

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Symptoms

When you configure MDM Link, it fails with error Applying configuration settings... Failed. The underlying connection was closed: the connection was closed unexpectedly:

Cause

PMM Proxy can't connect to the MDM server over the service port.

You can verify it using PowerShell command Test-NetConnection MDM_sever_public_FQDN -Port ServicePort , where

MDM_sever_public_FQDN is the public FQDN of the MDM server you specified when configured MDM component;
ServicePort is the port used for incoming Parallels Mac Management connections.

It must return TcpTestSucceeded : True, otherwise, the connection is blocked.

Resolution

Adjust firewall settings to allow incoming TCP connections from PMM Proxy to the MDM server public FQDN over the service port.

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