The problem 1.0I'm working on a server that only supports two-factor auth (keypair auth is disabled). So every time my SFTP client wants to upload a file, it asks me for a token... after 3 minutes that becomes a not_very_nice UX.The solution 1.0So I learned about SSH multiplexing and now I can open one master connection manually (from the terminal), and all other ssh connections can be multiplexed on top, like so:$ ssh example_com_masterVerification code: (/me enters the token code)Password: (/me enters my pass)Welcome to Ubuntu 14.04 blah blah....Last login: Wed Oct  1 11:24:15 2014 from 12.34.56.78$Then, from another terminal, or by another piece of software:$ ssh my.example.comLast login: Wed Oct  1 16:34:45 2014 from 12.34.56.78$ So, mission accomplished, no more entering 2FA token. And no password, for that matter, SSH FTW!~/.ssh/config:Host example_com_master  HostName my.example.com  User username  PubkeyAuthentication no  ControlMaster yes  ControlPath ~/.ssh/sockets/example_com  ControlPersist 10Host my.example.com  HostName my.example.com  User username  PubkeyAuthentication no  ControlMaster no  ControlPath ~/.ssh/sockets/example_comProblem 2.0 (TLDR)Some software (e.g. PyCharm IDE) use their own SSH library / binary / whatever!Meaning that nothing I type in ~/.ssh/config will affect it, AFAIK.That's my current problem: is there a way to trick such software into using an already existing master connection?An idea: because you can usually configure software to use a different port to connect to, I was wondering if it might be possible to set up some kind of tunneling that will multiplex incoming connections onto existing master. But my foo has failed me...edit:Main purpose is to connect to remote Python interpreter/debugger.edit 2:All the ports are closed other then 22 and 80. It is, however, possible to do:remote$ ssh localhost:2222(password or securekey login, both work)remote$ but 2222 in only open for connections from localhost, and admins won't open any additional ports, saying anyone could use it.
Work around two-factor SSH auth with Master connection and port forwarding?
ssh;ssh tunneling