Unknown DNS error on my web server

I’m running Windows 2000 Server as a webserver. All is fine except for one issue I can’t seem to resolve. In my Events Log, System Log, I keep getting the same error and it is continuously generating until the log fills and locks the machine. Theerror is as follows:

Registration of the DNS record ‘_kpasswd._udp.sogo-online.com. 600 IN SRV 0 100 464 sogomain.sogo-online.com.’ failed with the following error:
DNS server unable to interpret format.

The ‘source’ is NETLOGON.

My Registered name for my website is www.sogo-online.com. My machines name is SOGOMAIN. Anyone have any suggestions? Thanks.