Are you experiencing that SSH tunnels is disabled after upgrading to Synology DSM 4.1 or 4.2? Don’t worry – it’s an easy fix. Log on to your NAS using SSH and ensure that you log on as root (the password is the same as for the admin-account). I.e:

ssh root@192.168.1.114

Then edit the following file using VI (look for the basic VI command here):

vi /etc/ssh/sshd_config

Ensure that the following is uncommented and set to yes:

AllowTcpForwarding yes
GatewayPorts yes
PermitTunnel yes

Restart the NAS and now you should be able to use tunnels in putty. This guide can help you on this topic:

http://www.extremetech.com/computing/93106-escaping-the-firewall-with-an-ssh-tunnel-socks-proxy-and-putty

To use the tunnel and socks proxy in Firefox, look here:

http://lifehacker.com/237227/geek-to-live–encrypt-your-web-browsing-session-with-an-ssh-socks-proxy

Good luck :)