9003
Puma / Custom App
Medium RiskTCP — Web
Port Overview
Port Number
9003
Service Name
Puma / Custom App
Transport Protocol
TCP
Category
Web
Security Risk
Medium
Port Range
Registered (1024-49151)
What is Port 9003?
Port 9003 is commonly used by Puma, the Ruby web server, and various custom applications as a development or internal service port. It appears in PHP-FPM process manager configurations and some Nginx upstream proxy setups. While not an officially assigned port, it is frequently encountered in web application stacks.
TCP
Web
Security Considerations
Port 9003 (Puma / Custom App) is classified as medium risk. While this service is commonly exposed, consider using encrypted alternatives where available.
Recommendation: Keep the service updated. Monitor logs for unusual activity.