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</script></nav></div><div class="container mainContainer"><div class="wrapper"><div class="post"><header class="postHeader"><h1 class="postHeaderTitle">Firewall & Port Forwarding</h1></header><article><div><span><p><br/></p>
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<p>Captain uses:</p>
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<ul>
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<li>80 TCP for regular HTTP connections</li>
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<li>443 TCP for secure HTTPS connections</li>
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<li>3000 TCP for initial Captain Installation (can be blocked once Captain is attached to a domain)</li>
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<li>7946 TCP/UDP for Container Network Discovery</li>
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<li>4789 TCP/UDP for Container Overlay Network</li>
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<li>2377 TCP/UDP for Docker swarm API</li>
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<li>996 TCP for secure HTTPS connections specific to Docker Registry</li>
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</ul>
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<p>Or simply disable firewall entirely. In case of an ubuntu server, run <code>ufw disable</code>.</p>
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<p>Also, if you are using Port Mapping to allow external connections, for example from your laptop to a MySQL instance on Captain, you will have to add the corresponding port to the exclusion as well.</p>
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