Tag Archives: DNS

DCDiag error 81 and DNS errors

Figure this situation: lots of Active Directory and DNS related errors, DCDiag immediately returned error 81.

Solution: rebooting the server did the trick. You don’t have to be a rocket scientist to solve seemingly complex issues 😉

Of course this will not always solve errors 81, but it will probably not hurt to try a reboot first …


Kaminsky’s DNS Bug

To find out if your PC is vunerable for the DNS bug discovered by Dan Kaminsky, check out http://www.doxpara.com/ and click on “Check My DNS”.

You’ll find more technical details about the DNS bug on the same page, or here: http://www.linuxjournal.com/content/understanding-kaminskys-dns-bug.

Clients cannot dynamically register DNS records

If you use a domain with single-label DNS name (for example mydomain instead of mydomain.net) – which is not recommended – you need to do some extra steps otherwise Win2000 or XP clients will not able to dynamically register DNS records.

For more info, see the following Microsoft article:

Information about configuring Windows for domains with single-label DNS names