Fixing CSRF Verification Failure in Django Admin

Based on your description, you're experiencing a CSRF verification failure when trying to log in to your Django admin panel. This is a common issue when deploying Django applications, especially when dealing with domains and cookies. Here are some steps to resolve this issue:

1. Check Your Cookie Domain Settings

The login cookie might not be set correctly because the domain of the cookie sent by Django doesn't match the domain in your browser. Try setting the SESSION_COOKIE_DOMAIN to match your domain:

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# settings.py
SESSION_COOKIE_DOMAIN = 'your-app-domain.railway.app'  # Replace with your actual domain

2. Verify CSRF Cookie Settings

Make sure your CSRF cookie domain is also properly configured:

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# settings.py
CSRF_COOKIE_DOMAIN = 'your-app-domain.railway.app'  # Should match your domain

3. Ensure CSRF_TRUSTED_ORIGINS is Properly Formatted

Double-check that your CSRF_TRUSTED_ORIGINS includes the full URL scheme:

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# settings.py
CSRF_TRUSTED_ORIGINS = [
    'https://your-app-domain.railway.app',
    'http://your-app-domain.railway.app'  # Include if you're using HTTP
]

4. Check ALLOWED_HOSTS Configuration

Ensure your ALLOWED_HOSTS is correctly set:

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# settings.py
ALLOWED_HOSTS = ['your-app-domain.railway.app', 'www.your-app-domain.railway.app']

5. Enable Debug Temporarily

As the error message suggests, temporarily set DEBUG=True to get more detailed information about the CSRF failure:

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# settings.py
DEBUG = True  # Remember to set this back to False after debugging

6. Check for HTTPS/HTTP Mismatch

If your site is served over HTTPS but your forms or links use HTTP, this can cause CSRF issues. Ensure all your URLs use the same protocol.

7. Custom CSRF Failure View

If you want to get more information about the CSRF failures, you can set up a custom CSRF failure view:

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# settings.py
CSRF_FAILURE_VIEW = 'your_app.views.csrf_failure'

# In your_app/views.py
def csrf_failure(request, reason=""):
    from django.http import HttpResponse
    return HttpResponse(f"CSRF verification failed. Reason: {reason}", status=403)

Remember that CSRF failures are logged as warnings to the django.security.csrf logger, so checking your logs might provide additional information about what's causing the issue.