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Thanks to everyone who has responded. Tried disabling IPV6, the problem remains. I've done checks for viruses and malware, everything comes up clean. The machine is using local DNS servers, and the default hosts file. At this point, I feel like the most satisfying solution would be a big hammer but alas, I'm guessing that wouldn't go over very well. I'm tempted to just do a clean reinstall of the OS, I'm betting there's a good chance I wouldn't see this problem again, but I hesitate to do that without understanding what's going on in the first place. Al -----Original Message----- From: Jeffrey Utter [mailto:[log in to unmask]] Sent: Friday, July 17, 2009 3:26 PM To: Al Puzzuoli Subject: RE: [MSUNAG] Dnscache in Svchost using over 60% of CPU? You can try the suggestion in the last post in this thread: http://social.technet.microsoft.com/Forums/en-US/itprovistanetworking/th read /d2a2ad2d-a406-410c-9b7a-e22104fd2e2e if that works I'll let you pass it along to NAG, but I didn't want to spam them a solution I hadn't tested. Good luck, Jeff Utter -----Original Message----- From: MSU Network Administrators Group [mailto:[log in to unmask]] On Behalf Of Al Puzzuoli Sent: Friday, July 17, 2009 2:57 PM To: [log in to unmask] Subject: [MSUNAG] Dnscache in Svchost using over 60% of CPU? Having an issue on a Vista Business box. Long story short, a case of very high CPU utilization. I tracked the culprit down to the DNS client service (Dnscache), but that's only half the battle. Now that I know Dnscache is the offending service, what to do about it? This machine is part of my domain. As far as I know, no other machines on the domain are exhibiting the same issue. I tried doing an ipconfig /flushdns, but that didn't matter. Anyone have ideas as to what might cause this and what I could do to fix it? Thanks, Al Puzzuoli Michigan State University Information Technologist http://www.rcpd.msu.edu Resource Center for Persons with Disabilities 120 Bessey Hall East Lansing, MI 48824-1033 517-884-1915