Ports that are blocked by browsers
a year ago
- #Web Development
- #Docker
- #Security
- Experimenting with Docker and Flask revealed that some ports are blocked by browsers due to security vulnerabilities.
- Port 6000 was blocked by Chrome, Safari, and Firefox, each displaying different error messages for the same issue.
- The blocking is due to Cross-protocol scripting vulnerabilities, preventing attacks on services like IMAP, SMTP, and others.
- Firefox provides the most informative message, indicating the request is canceled before reaching the server.
- Using cURL bypasses browser restrictions, proving the issue is browser-specific.
- A list of commonly blocked ports includes those used for FTP, SSH, SMTP, and other services to prevent exploitation.