Troubleshooting the 403 Invalid Signature Error in Laravel

If you're seeing a "403 Invalid Signature" error on your Laravel website, there are a few steps you can try to troubleshoot and fix the problem.

Check Your Proxies

One possible cause of this error is an issue with your application's proxy configuration. In your app/Http/Middleware/TrustProxies.php file, you can set the $proxies variable to to trust your proxies.

Try adding your proxy IP address(es) to the $proxies array.

protected $proxies = ['123.0.0.0', '123.0.0.1'];

Or you can set it to a wildcard string.

protected $proxies = '*';

For more information on configuring trusted proxies, see the Laravel documentation.

Check Your Nginx Configuration

Another cause of the "403 Invalid Signature" error is an issue with Nginx configuration. In your /etc/nginx/sites-enabled/mydomain.com file, check the location block for any extraneous query parameters. For example, you might see something like this:

location / {
    try_files $uri $uri/ /index.php?q=$query_string;
}

If you see a q= parameter like this, try removing it and replacing it with ? before the $query_string

location / {
    try_files $uri $uri/ /index.php?$query_string;
}

Then, restart Nginx to apply the changes:

sudo /etc/init.d/nginx restart

If these steps don't fix the issue, you may want to try replacing your Nginx configuration with the recommended configuration from the Laravel documentation. I hope these suggestions help you solve the "403 Invalid Signature" error on your Laravel website.