Port 445 (TCP) — SMB

Windows file sharing (Server Message Block).

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Exploited by WannaCry/EternalBlue. Never expose to the internet.

Check if port 445 is open

On the server, see what is listening:

sudo ss -tulpn | grep ':445 '

From another machine, test reachability:

nc -zv your-server.example.com 445

With UFW (Ubuntu/Debian):

sudo ufw deny 445

With firewalld (RHEL/AlmaLinux/Rocky):

sudo firewall-cmd --permanent --remove-port=445/tcp && sudo firewall-cmd --reload