Reverse tunnel with 4 participants (really a mess)

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http://serverfault.com – I have a server (Win 2008) and a desktop PC (Win 7) at my work behind a firewall. The server doesn't has internet connection for security (actually, it is in a remote datacenter), and the desktop PC has a Logmein client installed, so I can use this PC from my house, and connect me to the server. Now I need to connect me to the MS SQL Server in the server from a MS SQL Server client in my home, but I can't figure out how can make a remote tunnel like that... to be more explicit: ______________________________________________ | Firewall at work | | ________________ (HowTos)