pgAdmin 4: How to establish a connection through an SSH tunnel/interface in Windows

I installed the latest pgAdmin 4 (v2.1) but I found out that (related thread), for the moment, the only way to establish a connection through an SSH tunneling is using another outside process, an example in the pgAdmin's forum says:

I setup a tunnel as follows:

ssh -f dpage(at)hostname(dot)enterprisedb(dot)com -L 5999: hostname.enterprisedb.com:5432 -N

(...) I was running on Mac, but the same procedure should work on Linux. On
Windows, there's a tunnelling app in Putty iirc, but I don't know how
to use it offhand.

I have found a simple PuTTY tutorial to establish a connection using an SSH Tunnel.

The connection is established but it seems, when I try to connect through pgAdmin it fails or is refused (using 127.0.0.1:3306 or 127.0.0.1:5432 as the tunnel's destination). Why?

So in this step of that PuTTY SSH tunnel tutorial:

I used instead 5432 as the Source port and my.tunnel.domain:5432 as the Destination.

Then in the connection details:

In the Host Name I placed the server to connect to (the one with the DB: my.db.domain), but the login credentials relate to the tunnel's my.tunnel.domain (e.g. Connection > Data has the tunnel's domain user and Connection > SSH > Auth has the tunnel's domain private key).

I opened this connection (it opens up a window with a terminal, if successful) and finally in the pgAdmin 4 (v2.1) Create Server... window, I just added localhost as the Host name/address and 5432 as the Port, with the credentials relating to the my.db.domain:

The DB connection is established and works normally if the PuTTY window with the terminal is active.

Another and more verbose tutorial on how to set a Putty SSH tunnel can be found here.

StackExchange Database Administrators Q#199473, answer score: 11