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SSH Tunnel on PuTTY

January 5, 2019 by Rumi

Most of you have probably used a tunnel with an SSH connection. What you probably weren’t aware of is that you can use a dynamic tunnel to access all remote infrastructure. Furthermore, you can specify a port and a destination IP to have direct access. This process is achieved through your PuTTY configuration.

In this procedure, we will use Internet Explorer, Firefox and an RDP connection to demonstrate the use of a tunnel with an SSH connection, as well as configuring the tunnel with several other protocol types.

Local Port Forwarding

Step 1 – Load the Session
In your PuTTY configuration, configure the Host Name and Port of your remote SSH computer. Enter your Saved Sessions name, and click Save. If your session already exists, Load it as shown below:

How to Encrypt VNC Traffic with Putty

December 9, 2015 by Rumi

By default, VNC is not secure protocol.VNC uses encryption during initial connection and login (passwords are not sent in plain-text). Once, we connected then all the VNC data is unencrypted and hacker could sniff our VNC session. It is better (safer) to start VNC server only on 127.0.0.1(localhost) and tunnel it over secure SSH tunnel (For this,there are options in Putty).

In this example, I am using CentOS 6.2 as VNC server and VNC Viewer & PuTTY as VNC client on Windows 7.

On CentOS, edit /etc/sysconfig/vncservers file:

sudo nano /etc/sysconfig/vncservers

Add the option “-localhost“:

How to Update SSH & MOTD Banner on CentOS 6

December 7, 2015 by Rumi

For legal reasons, Some people need to display a warning banner on their Linux machine before login so that a person requires to acknowledge the contents of the banner before entering the password. To do this, edit a/etc/issue.net file and fill it with the desired context.

Edit the /etc/issue.net file:

sudo nano /etc/issue.net

Here is mine banner as a sample, you can add your’s here:

#########################################################
# Authorized access only! # 
# Disconnect IMMEDIATELY if you are not an authorized user!!! #
# All actions Will be monitored and recorded #
###############################################################

Secure RDP connection through Vyatta using PuTTY

December 6, 2015 by Rumi

Connecting to SSH Server as gateway instead of directly RDP to a PC is safer way and add another layer ofencryption.With this method,we can connect to any client that is behind the firewall provided that we have open the port 22 (or any other SSH port) to the SSH Server.

In First step, we’ll configure the vyatta, so that it will forward the ssh request to the internal Linux server that it will receive on it’s port 222.

(From the Configuration Mode, issue these commands)