Charlie, I developed a similar problem yesterday when I replaced the SMTP proxy on my Watchgaurd X500 with the SMTP filter. With just the proxy enabled, DNS resolves fine. But when I enable the SMTP filter, DNS queries run amok and the firewall logs fill up with DNS traffic. Web browsing slows to a crawl and exchange queues back up. I blame Watchguard, but I haven't been able to find a solution yet other than sticking with the Proxy which has to go for an unrelated reason.
Bill -----Original Message----- From: Charlie Kaiser [mailto:[email protected]] Sent: Thursday, April 30, 2009 7:22 AM To: NT System Admin Issues Subject: RE: DNS issue Yeah; I saw that one, but it's a client-side setting only. I set that on the Exchange server, but it doesn't affect the DNS server's caching of outside lookups... And that's where the issue lies... *********************** Charlie Kaiser [email protected] Kingman, AZ *********************** > -----Original Message----- > From: Jeff Bunting [mailto:[email protected]] > Sent: Thursday, April 30, 2009 6:52 AM > To: NT System Admin Issues > Subject: Re: DNS issue > > Here's an article about changing the negative caching: > http://windowsitpro.com/article/articleid/48528/controlling-po > sitive-and-negative-caching.html > > Jeff ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
