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What this test does is connect to xyz.dns.ipeak.net many times and note which DNS server resolved each of the requests. xyz here is a 40 characters long string which is randomized. This way one can detect most if not all used DNS servers. The randomization is done to avoid DNS caching – otherwise we'd only get shown what the fastest request resolved to. In other words: First request goes out to the net and for the other 99 connections the DNS resolver would reply "hey, I remember this name, here's the address I got earlier". If you get an error, it can have a multitude of reasons. The request couldn't be made because of a firewall or so. The request was made but you got a HTTP 4xx or 5xx code back. Can happen if there are temporary problems, but seeing as it's a constant thing for you, it's quite unlikely. Some of your configured DNS servers did not return a usable result (like NXDOMAIN or SERVFAIL, probably NODATA as well) or simply timed out (if some of those tests took their time). May be the most likely explanation. Any errors are not a security problem per se; they have nothing to do with server security. You can use all servers showing this without compromise. When using them it can mean occasional waiting times when resolving something, but if you didn't experience it so far, it won't happen.