With ALL modules and scheduled tasks disabled the result is same - a DNS query every 5 minutes. I assume you are referring to outbound port 53 connections?The only outbound connections on port 53 should be to your ISP or third party DNS, if so configured, servers.
Yes, of course. I should have communicated better.The point is, ekrn.exe queries DNS server every 5 minutes, but doesn't establish connection to any address, which seems a lot like a bug.
This behavior is more apparent in my case, as i have DNS caching service disabled on my machine (caching done by server). I believe on most PCs with caching enabled these queries are obscured by more frequent, but less evident calls to DNS cache.