Sometimes it happens that you can’t use your services cause they deal with blocked ports. For exampel you use mysql on the commandline and it is by some reason denied. A proxy can help you. Tsocks helps you to use a proxy. Tsocks is a library for intercepting outgoing network connections and redirecting them through a SOCKS server.
install tsocks with
sudo apt-get install tsocks
Configure the file /etc/tsocks.conf
# the proxys address server = 10.100.13.50 # the server type server_type = 5 # the proxys port server_port = 3306
and finally call your command like this:
tsocks mysql -h myHost -u myUser -pPassword