tunnel-ssh | fantastic ssh2 library by Brian White | SSH Utils library

I am able to connect to the database now.

1. Make a tunnel through Bastion to the Database from the terminal.

   ssh -L 27017:{mongodb-host}:27017 host1

2. I am able to connect to database via the tunnel from localhost in another terminal.

   mongo --host 127.0.0.1:27017 --username {username} --password {password}

So I am able to connect through mongoose too using connection string. mongodb://dbadmin:{username}:{password}@localhost:27017

You know when you ask a question and then 1 minute later you think of something new to try, and that new thing completely works?

I think I don't need to use tunnel-ssh at all because I already opened the server to allow remote access from my laptop. This works for me

The issue is that you're re-establishing the tunnel to the server inside the onRequest handler. This will be done every time your webhook is called without shutting it down, so the address remains in use and the error is thrown.

Better probably would be to setup the server when the function is initialized - so outside the onRequest handler.

[update once you tried to setup server outside onRequest] The reason it's telling you that it can't find a function is because you have the export statement inside the callback function that tunnel() calls. Exports must be done at load time, not when the script is executed

The easiest solution is to not have a callback when you setup the tunnel (or to just use it to record success or error). So something like

SOLVED

I have not used the tunnel-ssh package you have mentioned, but I went through the docs and I see that you are using it wrong. I simply copied the configuration given in the docs of tunnel-ssh and it started working for me. pasting the entire code below