Share problem.

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http://ubuntuforums.org – Hello, Ubuntu 12.04 LTS computer does not allow to access to the folder shared when Ubuntu computer detect an Internet connection, I have to turn off the Internet connection and Ubuntu allows me again to access to the folder shared, normally Ubuntu computer does not have Internet connection, I block by firewall computer, I have a computer with Firewall,all incoming and outgoing from Internet go through this computer , I don't know how Ubuntu detect Internet connection, why does Ubuntu block the access to the folder shared?,,if somebody can help me, thanks in advance. (Hardware)