在Windows上使用Python通过SSH连接数据库时出错

Question

I have a snippet of code that allows me to connect to my psql DB via ssh in Python. It works perfectly on Ubuntu 18.10 (via VirtualBox) but fails every time on windows with an error that it can't reach the remote host and port.

I'm been developing a user interface that can query data from a remote DB (logs etc.) and visualize it.

All of the development has been done using Spyder3 on Ubuntu 18.10. I never had an issue until I tried to execute the same code on Windows 10.

I tried Telnet to both the localhost:port and remote host:port (via ssh) and it works. Having looked up all the possible answers on stackoverflow and other places, I still haven't been able to fix the issue. The fact that it works on one environment and not on the other, while on the same machine, tells me it's some sort of environment setting but I don't know what it could be.

The code:

import psycopg2
import logging
logging.basicConfig(level=logging.DEBUG)

from sshtunnel import SSHTunnelForwarder

PORT = 5432
REMOTE_HOST = '111.222.111.222'
REMOTE_SSH_PORT = 22
curs = None
conn = None


server = SSHTunnelForwarder((REMOTE_HOST, REMOTE_SSH_PORT),
     ssh_username='username',
     ssh_password='password',
     remote_bind_address=('localhost', PORT),
     local_bind_address=('localhost', PORT))

server.start()
conn = psycopg2.connect(database='db_name', user='db_username', password='db_password', host='127.0.0.1', port='5432')
curs = conn.cursor()

Expected: A successful connection to ssh and subsequent successful log-in to the database. This works on Ubuntu 18.10 via VirtualBox on the same machine.

Actual result: 2019-01-02 10:54:51,489 ERROR Problem setting SSH Forwarder up: Couldn't open tunnel localhost:5432 <> localhost:5432 might be in use or destination not reachable

Answer 1

I may be wrong, but I think the remote_bind_address should be set to your server's private IP. As this is where the remote machine would communicate to your machine.

 remote_bind_address=(<PRIVATE_SERVER_IP>, PORT)

Answer 2

我意识到我的本地postgres（psql）服务正在干扰端口映射，因为它也正在使用端口5432。一旦我禁用了该服务，它就像一个魅力。