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How do I know if a TCP port is open or closed? - Synology Knowledge Center
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How to check if port is in use on Linux or Unix - nixCraft
Linux Check If Port Is Blocked by Firewall
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![SOLVED] Cant open ports in firewall](http://i.imgur.com/zIz8blg.png "SOLVED] Cant open ports in firewall")
SOLVED] Cant open ports in firewall
5 Ways to Check if a Port Is Opened - wikiHow
5 Ways to Check if a Port Is Opened - wikiHow
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