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deploy: d2a0a5de2ed450bb13c01ca08ef4130da68fba3a
2022-06-23 07:40:29 +00:00
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<h1>Debugging</h1>
<div class="admonition info">
<p class="admonition-title">Contributions Welcome!</p>
<p>Please contribute your solutions to help the community <img alt="❤" class="twemoji" src="https://twemoji.maxcdn.com/v/latest/svg/2764.svg" title=":heart:" /></p>
</div>
<h2 id="enable-verbose-debugging-output"><a class="toclink" href="#enable-verbose-debugging-output">Enable Verbose Debugging Output</a></h2>
<p>You may find it useful to set <a href="../../environment/#log_level"><code>LOG_LEVEL</code></a> environment variable.</p>
<h2 id="invalid-username-or-password"><a class="toclink" href="#invalid-username-or-password">Invalid Username or Password</a></h2>
<ol>
<li>
<p>Shell into the container:</p>
<div class="highlight"><pre><span></span><code>docker <span class="nb">exec</span> -it &lt;my-container&gt; bash
</code></pre></div>
</li>
<li>
<p>Check log files in <code>/var/log/mail</code> could not find any mention of incorrect logins here neither in the dovecot logs.</p>
</li>
<li>
<p>Check the supervisors logs in <code>/var/log/supervisor</code>. You can find the logs for startup of fetchmail, postfix and others here - they might indicate problems during startup.</p>
</li>
<li>
<p>Make sure you set your hostname to <code>mail</code> or whatever you specified in your <code>docker-compose.yml</code> file or else your FQDN will be wrong.</p>
</li>
</ol>
<h2 id="installation-errors"><a class="toclink" href="#installation-errors">Installation Errors</a></h2>
<p>During setup, if you get errors trying to edit files inside of the container, you likely need to install <code>vi</code>:</p>
<div class="highlight"><pre><span></span><code>sudo su
docker <span class="nb">exec</span> -it &lt;my-container&gt; apt-get install -y vim
</code></pre></div>
<h2 id="testing-connection"><a class="toclink" href="#testing-connection">Testing Connection</a></h2>
<p>I spent HOURS trying to debug "Connection Refused" and "Connection closed by foreign host" errors when trying to use telnet to troubleshoot my connection. I was also trying to connect from my email client (macOS mail) around the same time. Telnet had also worked earlier, so I was extremely confused as to why it suddenly stopped working. I stumbled upon <code>fail2ban.log</code> in my container. In short, when trying to get my macOS client working, I exceeded the number of failed login attempts and fail2ban put dovecot and postfix in jail! I got around it by whitelisting my ipaddresses (my ec2 instance and my local computer)</p>
<div class="highlight"><pre><span></span><code>sudo su
docker <span class="nb">exec</span> -it mailserver bash
<span class="nb">cd</span> /var/log
cat fail2ban.log <span class="p">|</span> grep dovecot
<span class="c1"># Whitelist IP addresses:</span>
fail2ban-client <span class="nb">set</span> dovecot addignoreip &lt;server ip&gt; <span class="c1"># Server</span>
fail2ban-client <span class="nb">set</span> postfix addignoreip &lt;server ip&gt;
fail2ban-client <span class="nb">set</span> dovecot addignoreip &lt;client ip&gt; <span class="c1"># Client</span>
fail2ban-client <span class="nb">set</span> postfix addignoreip &lt;client ip&gt;
<span class="c1"># This will delete the jails entirely - nuclear option</span>
fail2ban-client stop dovecot
fail2ban-client stop postfix
</code></pre></div>
<h2 id="sent-email-is-never-received"><a class="toclink" href="#sent-email-is-never-received">Sent email is never received</a></h2>
<p>Some hosting provides have a stealth block on port 25. Make sure to check with your hosting provider that traffic on port 25 is allowed</p>
<p>Common hosting providers known to have this issue:</p>
<ul>
<li><a href="https://docs.microsoft.com/en-us/azure/virtual-network/troubleshoot-outbound-smtp-connectivity">Azure</a></li>
<li><a href="https://aws.amazon.com/premiumsupport/knowledge-center/ec2-port-25-throttle/">AWS EC2</a></li>
</ul>
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