Port 1900: SSDP / UPnP
Device discovery on local networks. One of the most abused amplification protocols. It should never answer from the internet.
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Port 1900 at a glance
Port1900
ProtocolUDP
ServiceSSDP / UPnP
Open to the Internet?No, keep it on a private network
See What Is Listeningss -lntup | grep ':1900 '
Test From Outsidenmap -sU -p 1900 your-server
Block with UFWufw deny 1900/udp
Block with nftablesnft add rule inet filter input udp dport 1900 drop
SSDP / UPnP uses UDP port 1900. Device discovery on local networks.
One of the most abused amplification protocols. It should never answer from the internet.
If ss shows something listening on port 1900 on a public address, bind it to 127.0.0.1 or a private interface in the service's own configuration, and drop the port in the firewall as well.
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 1900 used for?
SSDP / UPnP. Device discovery on local networks.
Is it safe to open port 1900?
No, keep it on a private network. One of the most abused amplification protocols. It should never answer from the internet.
How do I check if port 1900 is open?
On the server, ss -lntup | grep ':1900 ' shows what is listening. From another machine, nmap -sU -p 1900 your-server shows whether the firewall lets it through.
How do I block port 1900?
With UFW: ufw deny 1900/udp. With nftables, add a drop rule for dport 1900 in your input chain.
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