Server socket no created

I have had this issue before, and cannot recall how to fix so it will be good to leave a trial for the future. Basically, I have not been able to create a socket connection.
I get this error in R, after the function Ping
MT5.Ping()
Error in base::socketConnection(host = "localhost", port = iPort, blocking = TRUE, :
cannot open the connection
In addition: Warning message:
In base::socketConnection(host = "localhost", port = iPort, blocking = TRUE, :
localhost:23456 cannot be opened
[1] FALSE

Do you know how to fix it?

Start with the MT5.Ping() call and the R socketConnection error for localhost:23456. Check how the MT5 server and port are expected to be started, then reproduce the failure and document or fix the setup so the socket connection succeeds reliably.

Written by the indexing model from the issue text.