SSHTunnel for remote access of postgres server

I'm new to using postgres as well as ssh and am having some trouble understanding what I need to do to get remote clients accessing a postgres server. Right now I've got one computer with a server running that I can access using psycopg2 but now I want to query the server using another computer. I've looked around and found examples using sshtunneler, but I feel like I'm missing some puzzle pieces.

import psycopg2
from sshtunnel import SSHTunnelForwarder
import time

with SSHTunnelForwarder(
         ('192.168.1.121', 22),
         ssh_password="????",
         ssh_username="????",
         remote_bind_address=('127.0.0.1', 5432)) as server:

    conn = psycopg2.connect(database="networkdb",port=server.local_bind_port)
    curs = conn.cursor()
    sql = "select * from Cars"
    curs.execute(sql)
    rows = curs.fetchall()
    print(rows)

My first confusion is I'm not sure what username/password should be. I downloaded putty and put the remote address info in the tunnel section using this tutorial but I have no idea if that's doing anything. When I try to start the server I get the error

2017-03-03 10:03:28,742| ERROR   | Could not connect to gateway 192.168.1.121:22 : 10060

Any sort of help/explanation of what I need to do would be appreciated.

If I can do it without ssh then that would be better. Currently running this:

psycopg2.connect(dbname='networkinfodb',  user='postgres', host='168.192.1.121', password='postgres', port=5432)

outputs...

OperationalError Traceback (most recent call last) in () ----> 1 psycopg2.connect(dbname='networkinfodb', user='postgres', host='168.192.1.121', password='postgres', port=5432)

OperationalError: could not connect to server: Connection timed out (0x0000274C/10060)
    Is the server running on host "168.192.1.121" and accepting
    TCP/IP connections on port 5432?

and I'm not sure where to go to figure out what the issue is.

So I didn't use ssh tunneling. That was only a backup as I was having trouble connecting to the database using psycopg2. I found that the firewall was blocking the port from being accessed externally so I was able to change that and now I can access the database from clients.