Could not find host or port information

What causes this issue?

The system could not find any host or port information.
Possible causes are:
The Internet Communication Manager is not active. Use transaction SMICM
to check whether the Internet Comunication Manager is active.
The Customizing settings for the host and port assignment are incorrect.
Use transactions SMICM and RZ11 to check whether the system settings are
correct.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.