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[ubuntu] please help open close ports!

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http://ubuntuforums.org – Hi Community: A few days ago, I got paranoid and decided to investigate increasing the security of some things. The thread of that security discussion is found at: http://ubuntuforums.org/showthread.php?t=2111909 I did a few things like install gufw and a few other things recommended at that thread. Also, I uninstalled gufw. I've found that my ubuntu machine (12.04), can no longer:cannot be accessed frm other devices on my network, and people with whom I shared files on Ubuntu one can no longer see the contents of my shared folders. I think I must have inadvertently closed ports (Hardware)