Using putty and firefox to tunnel across to web pages.
Download foxy proxy and add it to your browser (also available for chrome)
In putty on your cm connection go to SSH / Tunnels and enter a source port i.e 9080 and then click on Dynamic and save it your CM session.
Click add new proxy
In the Host or IP Address enter 127.0.0.1 in the Port enter your port number you entered in putty i.e 9080 and then click SOCKS proxy and ok
Now double click on your new entry
Give it a name i.e. Tunnel and change the colour so you can distinguish it, then click on the URL Patterns tab.
For each ip address pattern you want to connect to add a new URL pattern for example for 10.x.x.x addresses I enter 10.* for the name and *://10.* then click ok. This will allow we to connect to anything in that range once I have a successful tunnel open to CM.
Now open putty and connect to your CM session and login. Leave the session open. In your Firefox brower right click on the foxy proxy icon and select your new tunnel proxy. Enter the address of the device you are trying to connect to and if it is working you should see the foxy proxy icon spin.