Web & Dev
Risk: Medium
Port 8443 — HTTPS Alternate / UniFi Controller / Tomcat SSL
Port 8443 is the standard secondary SSL/TLS encrypted HTTPS port used by Apache Tomcat, UniFi Network Controllers, Jenkins, and client web dashboards without requiring root privileges.
PORT NUMBER
8443
PROTOCOL
TCP
DEFAULT PROCESS
java, node, unifi
FIREWALL TARGET
8443/tcp
Instant Terminal Fixes for Port 8443
macOS & Linux Terminal
1. Check who is listening on port 8443:
curl -k -I https://localhost:84432. Kill process occupying port 8443 (EADDRINUSE fix):
kill -9 $(lsof -t -i:8443)3. UFW Firewall Allow rule:
sudo ufw allow 8443/tcpWindows PowerShell (Admin)
1. Check listening port:
Get-NetTCPConnection -LocalPort 84432. Force kill process on port 8443:
Stop-Process -Id (Get-NetTCPConnection -LocalPort 8443).OwningProcess -Force3. Docker Port Forwarding Mapping:
docker run -p 8443:8443 -d my-secure-appCommon Error Encountered
Failed to bind to HTTPS port 8443: Address already in use.
Security Advisory & Hardening
Ensure the SSL certificate matches the domain to prevent client browser warning screens.
Frequently Asked Questions
Port 8443 Questions & Answers
Common questions regarding default services, kill commands, and firewall configurations.
Port 8443 is commonly used for HTTPS Alternate / UniFi Controller / Tomcat SSL. Port 8443 is the standard secondary SSL/TLS encrypted HTTPS port used by Apache Tomcat, UniFi Network Controllers, Jenkins, and client web dashboards without requiring root privileges.