Port 135 (TCP) — MS RPC

Microsoft RPC endpoint mapper.

🔒 Runs locally — your input never leaves this browser tab

Never expose to the internet.

Check if port 135 is open

On the server, see what is listening:

sudo ss -tulpn | grep ':135 '

From another machine, test reachability:

nc -zv your-server.example.com 135

With UFW (Ubuntu/Debian):

sudo ufw deny 135

With firewalld (RHEL/AlmaLinux/Rocky):

sudo firewall-cmd --permanent --remove-port=135/tcp && sudo firewall-cmd --reload