http://imil.net/blog/tags/bruteforce/ Recent content in Bruteforce on iMil.net Hugo en-us Sun, 09 Aug 2020 06:59:25 +0200 http://imil.net/blog/posts/2020/make-postfix-trigger-blacklistd-on-failed-authentication/ Sun, 09 Aug 2020 06:59:25 +0200 http://imil.net/blog/posts/2020/make-postfix-trigger-blacklistd-on-failed-authentication/ <p>The other day, I realized that from time to time, <a href="https://en.wikipedia.org/wiki/Alpine_(email_client)">alpine</a>, my console mail client for about 20+ years now, would close the connection to the <em>IMAP</em> server because of an &ldquo;error&rdquo;.<br> Digging in the logs, I realized my server was being bruteforced for months, if not years. <a href="https://www.NetBSD.org">NetBSD</a> being the fantastic OS it is, it actually had nearly no effect on my server&rsquo;s behaviour, only those annoying connections closing from time to time.<br> Here&rsquo;s a <code>/var/log/maillog</code> extract of such attacks:</p>