DNS cache poisoning can be accidental, but it can also be used maliciously to steal login credentials or other sensitive data. The DNS cache can also be poisoned, where it is given incorrect information by DNS servers. Enter this command into the Terminal window: sudo dscacheutil -flushcache sudo killall -HUP mDNSResponder and then press Enter. You can also access Terminal by navigating to Go > Utilities > Terminal. Type Terminal, and select Terminal from the search results. The cache can also become outdated, meaning that either the domain name or the IP address of the site you’re trying to reach has changed since the cache was last updated. Here’s how to flush your DNS cache on a Mac: Type Command + Space to open Spotlight. The DNS cache can become corrupted, where the information relating IP addresses to domain names is lost due to a glitch. Your PC’s DNS cache can save time, but if something goes wrong with it, it can cause connection errors. To save time, Windows 10 stores a copy of the information it gets from DNS servers locally on your PC. When a program tries to connect to a domain name like or, your computer queries a DNS server on the internet to get the corresponding numerical IP address. A Domain Network System (DNS) server is what translates familiar domain names like into the IP addresses computers use to connect with each other.
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