Port 3389: RDP
Windows Remote Desktop. The most common way into Windows servers for ransomware groups. Put it behind a VPN or restrict by source address.
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Port Lookup
Port 3389 at a glance
Port3389
ProtocolTCP/UDP
ServiceRDP
Open to the Internet?Only to addresses that need it
See What Is Listeningss -lntup | grep ':3389 '
Test From Outsidenc -zv your-server 3389
Block with UFWufw deny 3389/tcp; ufw deny 3389/udp
Block with nftablesnft add rule inet filter input meta l4proto { tcp, udp } th dport 3389 drop
RDP uses TCP/UDP port 3389. Windows Remote Desktop.
The most common way into Windows servers for ransomware groups. Put it behind a VPN or restrict by source address.
Allow port 3389 only from the addresses that need it: your office, a VPN or a bastion host. The firewall rule generator builds those rules for nftables, iptables and UFW.
Other Ports
20 FTP Data21 FTP22 SSH23 Telnet25 SMTP53 DNS67 DHCP Server80 HTTP110 POP3123 NTP143 IMAP161 SNMP389 LDAP443 HTTPS445 SMB465 SMTPS514 Syslog587 Mail Submission853 DNS over TLS993 IMAPS995 POP3S1194 OpenVPN1433 Microsoft SQL Server1900 SSDP / UPnP2049 NFS2083 cPanel (SSL)2087 WHM (SSL)3306 MySQL / MariaDB3389 RDP3478 STUN / TURN5060 SIP5432 PostgreSQL5900 VNC6379 Redis8006 Proxmox VE8080 HTTP Alternate8443 HTTPS Alternate11211 Memcached25565 Minecraft27017 MongoDB51820 WireGuard
Questions
What is port 3389 used for?
RDP. Windows Remote Desktop.
Is it safe to open port 3389?
Only to addresses that need it. The most common way into Windows servers for ransomware groups. Put it behind a VPN or restrict by source address.
How do I check if port 3389 is open?
On the server, ss -lntup | grep ':3389 ' shows what is listening. From another machine, nc -zv your-server 3389 shows whether the firewall lets it through.
How do I block port 3389?
With UFW: ufw deny 3389/tcp and ufw deny 3389/udp. With nftables, add a drop rule for dport 3389 in your input chain.
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