isso: Cannot send comments

Hello there!

I have an issue. I have followed the Quickguide instructions, and added Isso to my website, but I cannot send comments.

I am running isso in /opt/isso. The nginx is in /etc/nginx. These are my configuration files:

isso.cfg here. nginx.conf here. (here is the javascript code, in case it might be of help. Nothing special there. Just copy pasted from another site))

My html code is:

<!-- comments enabled (isso) --> 
<div class="comments">
    <h2 class="isso-title">Comments</h2>   
    <script type="text/javascript" 
        data-title="Comments"
        data-isso="//comments.127.0.0.1:4000/"
        data-isso-css="true"
        data-isso-lang="en"
        data-isso-reply-to-self="false"
        data-isso-require-author="false"
        data-isso-require-email="false"
        data-isso-max-comments-top="10"
        data-isso-max-comments-nested="5"
        data-isso-reveal-on-click="5"
        data-isso-avatar="true"
        data-isso-avatar-bg="#f0f0f0"
        data-isso-avatar-fg="#9abf88 #5698c4 #e279a3 #9163b6 #2069b6 #486910 #e4bf80 #0f0f0f"
        data-isso-vote="true"
        data-vote-levels="[-5,5,15]"        
        src="https://cdnjs.cloudflare.com/ajax/libs/embed-js/4.2.2/embed.min.js"></script>    
    <section id="isso-thread"></section>

</div> 

The comment’s box does appear on my website, but when I click submit, nothing happens.

This is what I do to run my site (locally):

• create my site locally: bundle exec jekyll serve (using jekyll). This gives me a server address at http://127.0.0.1:4000/
• enable virtual environment: source /opt/isso/bin/activate
• run isso: isso -c /opt/isso/isso.cfg run. This gives me the message: connected to http://127.0.0.1:4000/

Then, I go to a particular subdomain in my website (http://127.0.0.1:4000/blog/2017/097/hello/), and try to submit a comment, but nothing happens.

What is the issue? Am I actually running the proxy with nginx? Notice that my site is a blog and the comment box appears on every page. Is that ok?