Restrictive Firewall : How To Pass Through ?

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I'm using BtSync to sync my android smartphone, my Ubuntu laptop and a Ubuntu backup server.


The android phone and the laptop are behind a very restrictive firewall and can't sync with the Ubuntu backup server, and I'm looking for a solution. 


Here is a schema : 




What can I do to try pass this firewall, how can I test the port (to try to find one working) or have I to give up ?


With my laptop, I can reach the server with FTP, SSH, HTTP... Dropbox is working through this firewall.


Thanks !



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