TMS communication error with destination &4

What causes this issue?

There was an error during communication with the RFC destination
<LS>&V4&</>

System Response

The exact error message of the system is:
<LS>&V1&</>
<LS>&V2&</>
<LS>&V3&</>

How to fix this error?

The function terminates.

Procedure for System Administrators

Check your TMS configuration with the transaction STMS.

Error message extract from SAP system. Copyright SAP SE.