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How To Reset Your DNS Cache (MacMost #1887)
View in HD at . If you are having trouble accessing a website, it could be because of a problem with your DNS cache. To reset your DNS cache on your Mac, you need to enter a command using the Terminal. In most cases, this will work, especially if you are using macOS Sierra, High Sierra, or Mojave. Earlier versions of OS X may need some additional commands as well.