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<div class="section" id="brute-force-protection">
<h1>Brute force protection<a class="headerlink" href="#brute-force-protection" title="Permalink to this headline">¶</a></h1>
<p>Nextcloud has built-in protection against brute force attempts. This protects
your system from attackers trying for example a lot of different passwords.</p>
<p>Brute force protection is enabled by default on Nextcloud.</p>
<div class="section" id="how-it-works">
<h2>How it works<a class="headerlink" href="#how-it-works" title="Permalink to this headline">¶</a></h2>
<p>The brute force protection is easiest to see in action at the login page.
If you try to log in the first time with an invalid username and/or password you
will not notice anything. But if you do this a few times you start to notice
that the verification of the login is taking longer each time. This is the
brute force protection kicking in.</p>
<p>The maximum delay is 25 seconds.</p>
<p>After a successfull login the attempts will be cleared. And once a user is
properly authenticated they will not longer be hit by the delay.</p>
</div>
<div class="section" id="troubleshooting">
<h2>Troubleshooting<a class="headerlink" href="#troubleshooting" title="Permalink to this headline">¶</a></h2>
<p>On most setups Nextcloud will work out of the box without any issues. If you
run into a situation where login is often very slow for all users the first
step is to inspect the <cite>bruteforce_attempts</cite> table. There you can see
which IP addresses are actually throttled.</p>
<p>If you are behind a reverse proxy or load balancer it is important you make sure it is
setup properly. Especially the <strong>trusted_proxies</strong> and <strong>forwarded_for_headers</strong>
<cite>config.php</cite> variables need to be set correctly. Otherwise it can happen
that Nextcloud actually starts throttling all traffic coming from the reverse
proxy or load balancer. For more information see <a class="reference internal" href="reverse_proxy_configuration.html"><span class="doc">Reverse proxy</span></a>.</p>
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