reset the DNS cache

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reset the DNS cache

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OS X Mountain Lion or Lion

Use the following Terminal command to reset the DNS cache:



sudo killall -HUP mDNSResponder


Mac OS X v10.6

Use the following Terminal command to reset the DNS cache:



sudo dscacheutil -flushcache


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When you might want to do this

OS X keeps a local cache of resolved DNS queries for a time defined by the DNS server, but sometimes it may be necessary to reset the cache immediately and re-query a DNS server. For example, you might do this after an entry on the server is changed or a new entry is added.
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