The Broadband Guide
search advanced
 forgot password?

Port 27017 Details

known port assignments and vulnerabilities
threat/application/port search:
Port(s) Protocol Service Details Source
27017 udp steam Port used by Valve Steam Friends, an instant messaging protocol that is built into Steam, Counter-Strike, Xpire, MBL TF2 Tango.

IBM PowerVC 1.2.0.x through, 1.2.1.x through, and 1.2.2.x through does not require authentication for the ceilometer NoSQL database, which allows remote attackers to read or write to arbitrary database records, and consequently obtain administrator privileges, via a session on port 27017.
References: [CVE-2015-1937]
27017 tcp mongodb IANA registered for: Mongo database system SG
27000-27050 tcp,udp games Ports 27000 to 27050 are typically used by some online games.

Steam (Valve gaming platform) uses these ports:
27000-27015 udp (Steam client game client traffic)
27015-27030 tcp/udp (typically matchmaking and HLTV, also used to download Steam content)
27031 udp, 27036 tcp/udp, and 27037 tcp (incoming for in-home streaming)
3478 udp, 4379 udp, 4380 udp (outbound - Steamworks P2P networking and voice chat)
4380 udp (Steam client)
27015-27020 udp applications Dark Messiah of Might and Magic Steam Client Portforward
27010-27344 tcp,udp Unassigned. "Unauthorized Use Known on ports 27017 IANA
5 records found
jump to:
previous next

Related ports: 27015  27020  

« back to SG Ports

External Resources
SANS Internet Storm Center: port 27017

Port numbers in computer networking represent communication endpoints. Ports are unsigned 16-bit integers (0-65535) that identify a specific process, or network service. IANA is responsible for internet protocol resources, including the registration of commonly used port numbers for well-known internet services.
Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.

TCP ports use the Transmission Control Protocol, the most commonly used protocol on the Internet and any TCP/IP network. TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and that packets will be delivered in the same order in which they were sent. Guaranteed communication/delivery is the key difference between TCP and UDP.

UDP ports use the Datagram Protocol. Like TCP, UDP is used in combination with IP (the Internet Protocol) and facilitates the transmission of datagrams from one computer to applications on another computer, but unlike TCP, UDP is connectionless and does not guarantee reliable communication; it's up to the application that received the message to process any errors and verify correct delivery. UDP is often used with time-sensitive applications, such as audio/video streaming and realtime gaming, where dropping some packets is preferable to waiting for delayed data.

When troubleshooting unknown open ports, it is useful to find exactly what services/processes are listening to them. This can be accomplished in both Windows command prompt and Linux variants using the "netstat -aon" command. We also recommend runnig multiple anti-virus/anti-malware scans to rule out the possibility of active malicious software. For more detailed and personalized help please use our forums.

Please use the "Add Comment" button below to provide additional information or comments about port 27017.
  User Reviews/Comments:
by anonymous - 2010-02-01 20:17
Hey guys, just wanted to let you know this port is used by Steam in general to communicate information.

The below google doc is actually about old security issues present with TF2, another steam game. In the document, you can see that the port 27017 is being used to send and receive data.

by anonymous - 2011-10-13 17:48
Also the default port for mongodb:
News Glossary of Terms FAQs Polls Cool Links SpeedGuide Teams SG Premium Services SG Gear Store
Registry Tweaks Broadband Tools Downloads/Patches Broadband Hardware SG Ports Database Security Default Passwords User Stories
Broadband Routers Wireless Firewalls / VPNs Software Hardware User Reviews
Broadband Security Editorials General User Articles Quick Reference
Broadband Forums General Discussions
Advertising Awards Link to us Server Statistics Helping SG About