Event 5509 Is Reported in the DNS Log of Event Viewer (288176)

The information in this article applies to:

Microsoft Windows 2000 Server
Microsoft Windows 2000 Advanced Server

This article was previously published under Q288176

SYMPTOMS

The following event ID 5509 message is often reported in the DNS log of Microsoft Event Viewer:

Event 5509
(Warning) DNS_EVENT_BAD_UPDATE_PACKET
DNS Server encountered invalid UPDATE message from %1. Packet was rejected. The IP address of the specific client that was rejected is shown in the event.

-or-

Event 5509 (Warning)
The DNS server encountered an invalid DNS update message from "IP". The packet was rejected.

CAUSE

This issue can occur if you are using a computer that is running Windows 95, Windows 98, or Windows 98 Second Edition, and the computer name includes special characters, such as a number sign (#), an ampersand (@), or a dollar sign ($). You can use the characters in computer names when you use Windows 95 and Windows 98, but Windows 2000 DNS only supports the en dash character (-) and the underscore character (_), by default. If your computer name includes a different special character, the DNS server rejects the name registration in DNS.

RESOLUTION

To resolve this issue, use either of the following methods:

Find the computer name that has the unaccepted special character, and then change the name.

NOTE: This method is recommended.

-or-
Configure DNS so that it allows all names:
1. Start the DNS snap-in on the server.
2. Right-click the server and click Properties.
3. Click the Advanced tab, and then enter All Names in the Name Checking box.

Modification Type:	Minor	Last Reviewed:	1/27/2006
Keywords:	kbDNS kberrmsg kbprb KB288176