Alternative HTTPS
What is Port 8443?
Port 8443 is the most commonly used alternative HTTPS port, serving as the TLS counterpart to port 8080 in the same way that port 443 relates to port 80. Apache Tomcat defaults to port 8443 for HTTPS connections. Many application servers, management interfaces, and enterprise applications use 8443 for their encrypted web interfaces. Kubernetes dashboard, VMware vSphere, UniFi Controller, and numerous other tools default to port 8443. In environments where port 443 is reserved for the primary web application, secondary HTTPS services frequently run on 8443. The port is so widely recognized that many security scanners specifically check it for HTTPS services.
Common Uses
- Apache Tomcat HTTPS connector
- Kubernetes dashboard
- VMware vSphere Client interface
- UniFi Network Controller
- Enterprise management consoles
Technical Details
Copy-paste commands to check port 8443 (Alternative HTTPS) from your terminal
Test connectivity
nc -zv example.com 8443
curl -v --max-time 5 http://example.com:8443/
telnet example.com 8443
nmap -p 8443 -sV example.com
(echo > /dev/tcp/example.com/8443) 2>/dev/null && echo "open" || echo "closed"
Open port in firewall
sudo ufw allow 8443/tcp
sudo iptables -A INPUT -p tcp --dport 8443 -j ACCEPT
sudo firewall-cmd --permanent --add-port=8443/tcp && sudo firewall-cmd --reload
Security Considerations
Apply all standard HTTPS security practices — strong TLS configuration, valid certificates, HSTS headers. Many management interfaces on 8443 provide privileged access, so implement strong authentication and restrict access. Don't rely on the non-standard port for security — scanners check 8443 routinely.
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