Netflix Eureka
What is Port 8761?
Port 8761 is the default port for Netflix Eureka, a service discovery server used in Spring Cloud microservice architectures. Eureka provides a REST API for service registration and discovery — microservices register themselves with Eureka and query it to find other services. While Netflix open-sourced Eureka, it's most commonly used through Spring Cloud Netflix integration. Each microservice includes the Eureka client library and registers on startup. Other services query Eureka to find instance locations for load-balanced calls. Although Consul, etcd, and Kubernetes native service discovery have emerged as alternatives, Eureka remains popular in Spring Cloud ecosystems.
Common Uses
- Spring Cloud service discovery
- Microservice registration and lookup
- Load-balanced service communication
- Spring Boot application infrastructure
Technical Details
Copy-paste commands to check port 8761 (Netflix Eureka) from your terminal
Test connectivity
nc -zv example.com 8761
curl -v --max-time 5 http://example.com:8761/
telnet example.com 8761
nmap -p 8761 -sV example.com
(echo > /dev/tcp/example.com/8761) 2>/dev/null && echo "open" || echo "closed"
Open port in firewall
sudo ufw allow 8761/tcp
sudo iptables -A INPUT -p tcp --dport 8761 -j ACCEPT
sudo firewall-cmd --permanent --add-port=8761/tcp && sudo firewall-cmd --reload
Security Considerations
Enable Spring Security for the Eureka dashboard and API. Restrict access to the service registry. In production, use HTTPS and authentication. Monitor for unauthorized service registrations that could redirect traffic.
Popular Ports Reference
The most commonly used and referenced network ports