Tag: Domain Name System

Jul 30

DNS error while browsing top level domains like .com.mx or .com.uk

Symptom When name resolution is provided by root hints, Windows Server 2008 DNS and Windows Server 2008 R2 DNS Servers may fail to resolve queries for names in certain top-level domains. When this happens, the problem will continue until the DNS Server cache is cleared or the DNS Server service is restarted. The problem can be seen …

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Feb 25

Exchange Edge 2010: 451 4.4.0 DNS query failed

What causes 451 4.4.0 DNS query failed on Exchange Server 2010? After installing Microsoft Exchange Server 2010 Edge and subscribing to it all my emails were hanging on the queue and not being delivered to the hub server. I had all my network cards set up with my DNS server so I wash´t expecting any issues …

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Dec 20

How to: Clear or Flush DNS cache on a Mac OS X computer

How to: Clear or Flush DNS cache on a Mac OS X computer Most operating systems implement a local DNS cache for a number of reasons: lower the load on DNS servers, faster domain name resolution, etc. This is great for a number of reasons, but it also poses a problem from time to time. Most …

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