KB 322346 - Accessing Services Running on a Different Network via Jumphost using SSH Local Port Forwarding
Objective
Learn how to access services hosted on a remote network (such as an internal web server or application) from your local machine by leveraging a jumphost (also known as a bastion host) and SSH local port forwarding.
What is SSH Local Port Forwarding?
SSH local port forwarding creates a secure tunnel between your local machine and a remote server (via the jumphost). This tunnel allows you to securely access services running on the remote network by forwarding your local port traffic through the SSH connection.
Requirements
✅ Local machine with SSH client (Linux/macOS terminal or Windows PuTTY).
✅ SSH credentials for the jumphost.
✅ Access to the remote service from the jumphost.
Steps to Access the Remote Service
1️⃣ Identify the Remote Service and Jumphost Details
-
Remote Service Host IP/Hostname:
10.5.1.102 -
Remote Service Port:
80(HTTP example) -
Jumphost IP/Hostname:
100.105.71.94 -
Jumphost Username:
user(replace with actual username)
Using SSH Local Port Forwarding (Linux/macOS)
Open a terminal and run:
ssh -L 8080:10.5.1.102:80 user@100.105.71.94
Explanation:
-L 8080:10.5.1.102:80:-
Listen on your local port 8080.
-
Forward traffic to the 10.5.1.102:80 service through SSH.
-
user@100.105.71.94:-
Replace user with your actual SSH username.
-
This creates a secure tunnel from your local port 8080 to the remote service.
Access the Service in Your Local Browser
Open your browser and navigate to: http://localhost:8080
Using PuTTY on Windows
If you’re using PuTTY, follow these steps:
1️⃣ Open PuTTY and enter the jumphost IP: 100.105.71.94.
2️⃣ In the Category tree, navigate to: Connection > SSH > Tunnels (see step 1,2,3 on below screenshot)
6️⃣ Return to the Session category and click Open to start the SSH session.
7️⃣ In your browser, go to: http://localhost:8080
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