Restrictive Firewall : How To Pass Through ?


Librentez

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Hi, 

 

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 : 

 

post-35256-0-67548900-1386672673_thumb.p

 

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 !

 

Ron

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