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networking - Skype Bypass UFW While Transmission Can't Even Open Port - Ask Ubuntu
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How to open ports in UFW (Uncomplicated Firewall)
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How to Use UFW Firewall on Debian, Ubuntu, Linux Mint
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How to Set Up a Firewall with UFW on Ubuntu 18.04 | Linuxize
How to open ports in UFW (Uncomplicated Firewall)
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