Port 27017: MongoDB
MongoDB database connections. Tens of thousands of open MongoDB databases have been wiped and ransomed. Bind to localhost and enable authentication.
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Port 27017 at a glance
Port27017
ProtocolTCP
ServiceMongoDB
Open to the Internet?No, keep it on a private network
See What Is Listeningss -lntup | grep ':27017 '
Test From Outsidenc -zv your-server 27017
Block with UFWufw deny 27017/tcp
Block with nftablesnft add rule inet filter input tcp dport 27017 drop
MongoDB uses TCP port 27017. MongoDB database connections.
Tens of thousands of open MongoDB databases have been wiped and ransomed. Bind to localhost and enable authentication.
If ss shows something listening on port 27017 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 27017 used for?
MongoDB. MongoDB database connections.
Is it safe to open port 27017?
No, keep it on a private network. Tens of thousands of open MongoDB databases have been wiped and ransomed. Bind to localhost and enable authentication.
How do I check if port 27017 is open?
On the server, ss -lntup | grep ':27017 ' shows what is listening. From another machine, nc -zv your-server 27017 shows whether the firewall lets it through.
How do I block port 27017?
With UFW: ufw deny 27017/tcp. With nftables, add a drop rule for dport 27017 in your input chain.
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