<p>I recently deployed Minio stand-alone on a K0s pod. I can successfully use mc on my laptop to authenticate and create a bucket on my pod’s ip:9000.</p>
<p>But when I try to access the web console and login I get a POST error to ip:9000 and I am unable to login.</p>
<p>Would anyone know what’s causing this?</p>

<p>I've just started a minio container to verify this and it fact there are two ports you need to publish which are <code>9000</code> and <code>9001</code>.</p>
<p>You can reach the admin console on port <code>9001</code> and the API on port <code>9000</code>, hence your <code>mc</code> command which targets port <code>9000</code> works but trying to login on port <code>9000</code> fails.</p>
<p><a href="https://i.stack.imgur.com/eT5N3.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eT5N3.png" alt="MinIO admin console on port 9001" /></a></p>
<h2>Edit</h2>
<p>Now that I understand the problem better thanks to your comments I've tested on my Docker what happens when you login. And in fact there is a <code>POST</code> request happening when clicking on <code>Login</code> but it's not going to port <code>9001</code> not <code>9000</code>, so it seems the your webconsole somehow issues request to the wrong port.</p>
<p>Here a screenshot of the Network tab in my DevTools showing the request that's being issued when I press Login.
<a href="https://i.stack.imgur.com/UdDfQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UdDfQ.png" alt="Chrome Dev Tools: Login request" /></a></p>
<p>I've copied the <code>curl</code> for this request from the DevTool and added the <code>-i</code> flag so you can see the HTTP response code. You could try this with your appropriate <code>accessKey</code> and <code>secretKey</code> of course.</p>
<pre class="lang-sh prettyprint-override"><code>curl -i 'http://localhost:9001/api/v1/login'   -H 'Connection: keep-alive'   -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.83 Safari/537.36'   -H 'Content-Type: application/json'   -H 'Accept: */*'   -H 'Sec-GPC: 1'   -H 'Origin: http://localhost:9001'   -H 'Sec-Fetch-Site: same-origin'   -H 'Sec-Fetch-Mode: cors'   -H 'Sec-Fetch-Dest: empty'   -H 'Referer: http://localhost:9001/login'   -H 'Accept-Language: en-US,en;q=0.9'   -H 'Cookie: PGADMIN_LANGUAGE=en'   --data-raw '{&quot;accessKey&quot;:&quot;minio-root-user&quot;,&quot;secretKey&quot;:&quot;minio-root-password&quot;}'   --compressed
</code></pre>
<p>Expected result:</p>
<pre><code>HTTP/1.1 204 No Content
Server: MinIO Console
Set-Cookie: token=AFMyDDQmtaorbMvSfaSQs5N+/9pYgK/rartN8SrGawE3ovm9AoJ5zz/eC9tnY7fRy5k4LChYcJKvx0rWyHr/+4XN2JnqdsT6VLDGI0cTasWiOo87ggj5WEv/cK4OyFlWiv5cJA8GUgQhVmYSk7MqPCVnBlfrvXhF7FaXhy85zAvzuGnExaBv9/8vZFs2LDiDF/9RX3Skb2gzIPIKije0++q4mwllluLIrhxyGrDgO16u33fWnPMjtbmGvsaOJAjx178h19BxbVnacBFyUv7ep+TFQ3xTRFfHefIMQK9lulMZOb5/oZUgEPolZpiB1Z9IJoNHVnUDJRnIIQXjv0bti/Wkz5RnWSoFqDjUWBopqFOuWYM/GMDCVxMrXJgQ/iDSg12b0uo6sOFbtvokyccUHKp5TtEznadzMf3Ga9iiZ4WAAXqONTC4ACMGaHxgUPVD7NvlYkyOlb/dPL75q0g3Qj+hiI5FELqPLEXgXMFHAi0EQDsNo4IXeqlxTJpxQYTUXRgrx1Kg6IlRJ5P9eIKwnj/eXmvXe4lvQSXR7iwEviBa1NVl1alLP0d7eib75IfhiMo7Hvyywg==; Path=/; Expires=Sat, 26 Mar 2022 13:23:34 GMT; Max-Age=3600; HttpOnly; SameSite=Lax
Vary: Accept-Encoding
X-Content-Type-Options: nosniff
X-Frame-Options: DENY
X-Xss-Protection: 1; mode=block
Date: Sat, 26 Mar 2022 12:23:34 GMT
Connection: close
</code></pre>
