@Manuel_Serrano
I have issued many telnets without success. I have enabled SSH on ESXi and telnet to port 22 DOES work.
I have opened all in the security settings through vSphere client and enabled all ports from all IPs. Unless I am doing anything wrong, the only telnet I am able to open is against port 22.
¿Is there any screenshot which I can use to check if I am doing it right?
Many thanks for the help.