| Event Id | 5509 |
| Source | DNS |
| Description | 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. |
| Event Information | 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: Start the DNS snap-in on the server. Right-click the server and click Properties. Click the Advanced tab, and then enter All Names in the Name Checking box. |
| Reference Links | Event 5509 Is Reported in the DNS Log of Event Viewer |
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