My Rails app used to use OmniAuth to login in through Facebook/Twitter/Google accounts (different omniauth gems). Everything was working when my app was in some server which was preconfigured, but which I couldn't configure. Now I'm establishing my app in DigitalOcean and process of logging-in works only to some moment.

When I try to log in (with Google account) I receive following feedback:

  1. That’s an error.

Error: redirect_uri_mismatch

The redirect URI in the request, https://name_of_my_domain.com:80/auth/google_oauth2/callback, does not match the ones authorized for the OAuth client

I've noticed something what wasn't in "old" server - an url contains port 80 after my name of domain. Example:


The same :80 appears also for Facebook and Twitter url. I really believe that :80 is unnecessary, but I have no idea how to turn it off.

So then I tried to make a workaround and I added to "Authorised redirect URIs" in Google developers api:

Authorised redirect URIs:


So then I tried once again, I chose a Google Account to use and as a result I received following information from my browser:

This site can’t provide a secure connection name_of_my_app.com sent an invalid response.

Try running Windows Network Diagnostics.


Nginx error log is silent about any errors.

But, just in case, I provide my NGINX site configuration (/etc/nginx/sites-available/rails):

server {
    listen 80;
    root /home/rails/model_app/public;
    server_name name_of_my_domain.com;
    index index.htm index.html;

        location ~ /.well-known {
                allow all;

        location / {
                proxy_pass http://localhost:3000;

                proxy_set_header  Host $host;
                proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header  X-Forwarded-Proto $scheme;

                proxy_set_header  X-Forwarded-Ssl on;
                proxy_set_header  X-Forwarded-Port $server_port;
                proxy_set_header  X-Forwarded-Host $host;

File /etc/nginx/nginx.conf:

worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
        worker_connections 768;

http {
        sendfile on;
        tcp_nopush on;
        tcp_nodelay on;
        keepalive_timeout 65;
        types_hash_max_size 2048;

        server_names_hash_bucket_size 64;

        include /etc/nginx/mime.types;
        default_type application/octet-stream;

        ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
        ssl_prefer_server_ciphers on;

        access_log /var/log/nginx/access.log;
        error_log /var/log/nginx/error.log;

        gzip on;

        include /etc/nginx/conf.d/*.conf;
        include /etc/nginx/sites-enabled/*;

Off course I have a domain managed by DigitalOcean and generated Let's Encrypt certificate (whole page works well with https).

I have Load Balancer turned on, which I use for a page, where:

  • Forwarding Rules are:

HTTP on port 80 -> HTTP on port 80

HTTPS on port 443 -> HTTP on port 80

  • setting for SSL is set: Redirect HTTP to HTTPS (On).

So I think that there are two issues: one - port 80 in url, second - lack of secure connection when first problem "is solved". Any ideas how to solve both these issues?

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