"Trick 5: SSH back door
Many times I'll be at a site where I need remote support from
someone who is blocked on the outside by a company firewall. Few
people realize that if you can get out to the world through a
firewall, then it is relatively easy to open a hole so that the
world can come into you. In its crudest form, this is called
"poking a hole in the firewall." I'll call it an SSH back
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