Troubleshooting a Possible ModSecurity 403 Error Print

A blocked web request can sometimes appear as a 403 error, but not every 403 is caused by ModSecurity.

1. Confirm the URL and filesystem permissions are correct.
2. Check whether a custom .htaccess rule is denying access.
3. If the failure is reproducible and ModSecurity controls are available, temporarily disable ModSecurity for the affected domain.
4. Repeat the exact request.
5. Re-enable ModSecurity after the test.

If disabling ModSecurity makes no difference, continue investigating the other causes rather than leaving security protection disabled.