Microsoft KB Archive/315846

= You Can Connect with Telnet to Any IP Address on Port 389 =

Article ID: 315846

Article Last Modified on 10/31/2006

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APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition

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This article was previously published under Q315846



SYMPTOMS
If you turn on the Internet Connection Firewall feature in Windows XP and you try to use Telnet to connect to any valid IP address on port 389, the Telnet connection appears to be made successfully, even if the host is not listening on that port. The output from the netstat command shows that no local service is listening on port 389. This behavior also occurs with ports 21, 1002, and 1720. This behavior does not occur if you do not turn on the Internet Connection Firewall feature.



CAUSE
If the Internet Connection Firewall feature is on and you try to connect with Telnet to port 389, you actually connect to the local Lightweight Directory Access Protocol (LDAP) proxy that is part of the Firewall service.

Keywords: kbenv kbprb KB315846

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