Landscape Directory server address missing (long text)

What causes this issue?

The system cannot establish an HTTP connection to the Landscape
Directory, because it does not recognize the corresponding server
address.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Check that a valid primary <DS:TRAN.LCRSERVADDR>Landscape Directory
server address</> is entered in the Exchange Infrastructure
configuration.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.