Especially if they cause the primary DNS for a domain to hang. Not the server that runs this site, but one that I am involved in developing applications on. I’m far from a linux expert, but I know enough to be dangerous! rndc kept returning a “connection refused” message when called. So I checked rndc.conf, named.conf, rndc.key and everything looked peachy. It wasn’t until I did a `ls -lh`in the logs directory that I noticed that bind-queries.log was 2GB in size. On a hunch, i renamed that file and then tried rndc again. Presto! Too bad I went through nearly 5 hours of troubleshooting to get to that point, but glad to have found the root of the problem.