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When you need to create reverse SSH tunnel from your system/node.

**This is a security risk if the tunnel is left open; please advise with your IT/SysAdmin prior to opening up reverse SSH tunnel for ANYONE. Exxact Corp is not responsible for any security-related issues/events if using the below article to assist in this procedure.**

Step-by-step guide

1. SSH from the destination to the source (with public IP) using the command below:

   Code Block
   language java
   ssh –f –N –T –R 19999:localhost:22 sourceuser@138.47.99.99 ## '19999' can be any unused port

   
   

2. Now you can SSH from source to destination through SSH tunneling:

   Code Block
   language java
   ssh localhost -p 19999

   
   

3. 3rd party servers can also access 192.168.20.55 through Destination (138.47.99.99)
   Destination (192.168.20.55) <- |NAT| <- Source (138.47.99.99) <- Bob's server 
   
   

   1. From Example's server:

      Code Block
      language java
      ssh sourceuser@138.47.99.99

      
      

   2. After the successful login to Source:

      Code Block
      language java
      ssh localhost -p 19999 ## the connection between destination and source must be alive AT ALL TIMES

      
      

4. Closing SSH tunnel:
   • Rebooting system
   • Find the process and kill the PID

   • Remove all SSH sessions, all of them...

     Code Block
     language java
     sudo killall ssh

     
     

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