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How to fix 404 error nginx and Ubuntu 20 LTS Question Question
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Prolem: subdomain redirect to maindomain

Posted August 25, 2020 2.2k views
NginxUbuntu 20.04

Hi,
I’m creating a new subdomain (sub.example.com) on the same droplet as my main domain (example.com). I’m able to ping the subdomain and check DNS (https://www.digitalocean.com/community/tools/dns). However, whenever I come to sub.example.com, it still redirect me to my main domain’s content (the bar still shows sub.example.com).
My main domain is a wordpress website.
My sub.example.com.conf on etc/nginx/sites-available:
server {
listen 80;
root /var/www/sub.example.com;
index index.html index.htm index.nginx-debian.html;
servername sub.example.com www.sub.example.com;
location / {
tryfiles $uri $uri/ =404;
}
}

Hosts file: myip sub.example.com

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gnohpcntt
By:
gnohpcntt

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How to fix 404 error nginx and Ubuntu 20 LTS Question Question
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4 answers
gnohpcntt August 25, 2020

To be clarify,
when i go to sub.example.com it should shows the index.html I created, but it redirect me to sub.example.com/users/login and shows the login page for user on my main domain.

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baraboom August 25, 2020

Hi! That’s good you’ve verified that the DNS is resolving correctly. It seems you are on the right track with a separate nginx conf file for your sub-domain - did you restart nginx after making that file? You probably did but just in case ;)

I also like to try the new DNS / webhost config from multiple browsers and devices - the browsers today will cache the darnedest things. You could do this easily with an incognito window on your workstation and on your phone if thats available. This will verify that the problem is on the server and not just on your computer.

Otherwise, it sounds like your main domain web server (nginx) config might be overriding the subdomain config… here’s an article in the DO knowledgebase with some examples - if you have not already, please review what you have against what is presented in this tutorial:

https://www.digitalocean.com/community/tutorials/how-to-set-up-nginx-server-blocks-virtual-hosts-on-ubuntu-16-04

If you’re still stuck, please share a version of your main domain configuration so we can look for possible conflicts.

Hope this helps and good luck!

How To Set Up Nginx Server Blocks (Virtual Hosts) on Ubuntu 16.04
by Justin Ellingwood
When using the Nginx web server, server blocks (similar to the virtual hosts in Apache) can be used to encapsulate configuration details and host more than one domain off of a single server. In this guide, we'll discuss how to configure server blocks in Nginx on an Ubuntu 16.04 server.
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tomnguyen August 26, 2020

@gnohpcntt here is your checklist:

  1. Recheck your hosts file to ensure that sub.example.com point to the actual IP of your droplet.
  2. Your Nginx configuration file looks good. You put it in the /etc/nginx/sites-available folder. So don’t forget to create a symlink to it in the /etc/nginx/sites-enabled folder too.
  3. Reload Nginx to apply changes.

You should read Step Four: Enable your Server Blocks and Restart Nginx for more details.

How To Set Up Nginx Server Blocks (Virtual Hosts) on Ubuntu 16.04
by Justin Ellingwood
When using the Nginx web server, server blocks (similar to the virtual hosts in Apache) can be used to encapsulate configuration details and host more than one domain off of a single server. In this guide, we'll discuss how to configure server blocks in Nginx on an Ubuntu 16.04 server.
Reply Report
KFSys August 26, 2020

HI @gnohpcntt,

Apart from the other good answers, can you verify the subdomain is actually a blank website or is it a WordPress as well? I’m asking as it’s possible you are using either the same database for your subdomain or having your home url set to your main domain. Check that just in case as well.

Regards,
KFSys

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