I have got two machines. One running behind an HTTP proxy which only allows http connections to internet. (FTP, SSH everything else is not allowed through this network).
Second machine is a server with a public IP connected to internet. I can install any software on both these machines. Is there any tool that will help me access second machine from the first?
I would like do do things such as FTP transfer, remote login and so on.
Openvpn supports operation over an http proxy. Its client is available on most desktop platforms; the server is available on most unixes. Pro: you can use any network protocol transparently (including UDP and streaming). Con: some setup required; the overhead is noticeable in some applications; you need admin rights on both sides.
Httptunnel and Httptunnel each let you set up one TCP connection (e.g., ssh) over HTTP. Pro: you don't need admin rights on either side. Con: you need special software on the server side; expect noticeable overhead; ease of setup and use can vary.
If you're only interested in ssh, you can tell it to operate via the proxy by using a program such as corkscrew. Pro: little setup required; no special server-side setup; no connection overhead. Con: doesn't work if the proxy is too restrictive (e.g. doesn't let https through); specific to ssh.
It may help to run the server on port 80 or 443.
If your proxy doesn't support CONNECT (which is the case in most corporate envs), you are looking for software that uses plain GET&POST to encapsuate your traffic.
Take a look at chisel and crowbar, you may also want use openvpn as a additional layer. There is also softether which is quite promising.
