UDP Port 49 – tacacs

About UDP Port 49

The Internet Assigned Numbers Authority (IANA) registers port 49 for tacacs. The IANA description reads: ‘Login Host Protocol (TACACS)’. This port appears in 4 IDS rules and does not have notable malware activity indicators in our data.

IDS Rule References

4 IDS / security rules reference UDP port 49. Treat that number as context, not a danger score. Many detection rules are written against groups of ports rather than one service, web ports especially, so common web alternate ports inherit large counts while genuinely sensitive services can show few rules or none. Presence in IDS rules does not mean traffic on this port is malicious.

Rule categories (top 2): misc-activity (3), bad-unknown (1).

Sample rule descriptions for UDP port 49:

• INDICATOR-SCAN XTACACS logout
• POLICY-OTHER xtacacs login attempt
• INDICATOR-SCAN xtacacs failed login response
• POLICY-OTHER xtacacs accepted login response

Data Sources

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