On Tuesday, Cliff Pratt wrote: > On Tue, Mar 26, 2013 at 6:26 AM, <m.roth at 5-cent.us> wrote: >> Has anyone had problems accessing random websites since going up to 6.4? >> >> Since about the day after I got partly upgraded, if I try to access >> nytimes.com, or orbitz.com, I get server not found. >> >> With a lot of work, I, my manager, and the other admin, found that setting >> options edns0 in /etc/resolv.conf fixed it - I suspect that the network >> folks updated their internal nameservers (which are M$) about that time... >> but... we got this Thurs. Friday, I went to look, lunchtime, at a story, >> and back to the same. Later, and I think I was playing around, it came >> back. >> >> Just now, over lunch, it failed... until I restarted nscd. My manager >> tells me it's caching... but it seems to be caching momentary failures. >> >> So: has anyone else seen oddness that might be related to nscd? >> >Do you want the whole book? 'nscd' is a synonym for weird. I've had >many strange DNS issues which have been solved by either bouncing nscd >or purging its cache entries. > > However, you appear to be using nscd on your machine to cache DNS and > using the internal MS DSN servers to do the actual lookups. Am I > correct? In which case, the MS DNS server should be caching the DNS > lookups anyway, so you probably don't derive a lot of benefit from the > nscd unless you do a lot of repeated DNS lookups. > > Cheers, > > Cliff NSCD is also necessary if you're running an LDAP or NIS environment, so don't just turn it off if you're using external authentication services. In a Winbind environment, NSCD is unnecessary however. -- Gary L. Greene, Jr. Sr. Systems Administrator IT Operations Minerva Networks, Inc.