UDP Port 177 – xdmcp

About UDP Port 177

Port 177 is registered with the Internet Assigned Numbers Authority (IANA) for xdmcp. The IANA description reads: ‘X Display Manager Control Protocol’. This port appears in 2 IDS rules and does not have notable malware activity indicators in our data.

IDS Rule References

2 IDS / security rules reference UDP port 177. Presence in IDS rules does not mean traffic on this port is malicious. These are patterns security tools monitor.

Rule categories (top 1): attempted-recon (2).

Sample rule descriptions for UDP port 177:

• X11 xdmcp query
• X11 xdmcp info query

Data Sources

This information is compiled from: IANA Service Name and Transport Protocol Port Number Registry and Snort Community Rules (GPLv2).