What is the solution to server network port conflicts?

Solution to Server Network Port Conflicts:

Port conflicts occur when multiple services or applications attempt to use the same network port on a server, leading to connectivity issues. To resolve this:

1. Identify the Conflicting Ports
   Use commands like netstat -tuln (Linux) or Get-NetTCPConnection (PowerShell) to check which ports are in use. Example:

   netstat -tuln | grep :80
   

   If port 80 is occupied by multiple services, a conflict exists.

2. Change the Port for One Service
   Configure one of the conflicting services to use a different port. For example, if Apache and Nginx both use port 80, modify Nginx’s config file (/etc/nginx/sites-available/default) to use port 8080 instead:

   server {
       listen 8080;
       ...
   }
   

   Restart the service to apply changes.

3. Terminate Unnecessary Services
   If a service is unused, stop it to free the port. Example:

   sudo systemctl stop apache2
   

4. Use Port Forwarding (Advanced)
   If changing ports is not feasible, configure port forwarding (e.g., via iptables or a firewall) to redirect traffic from one port to another.

For cloud servers, Tencent Cloud provides tools to manage ports efficiently:

• Security Groups: Configure inbound/outbound rules to control port access.
• Server Load Balancer (SLB): Distribute traffic across multiple ports/services.
• Cloud Firewall: Monitor and block suspicious port activity.

Example: On Tencent Cloud, adjust security group rules to allow only specific ports (e.g., 80, 443) for web services.