The exact terminal command to flush the DNS in macOS differs depending on your running version.You may have to enter the administrator password for your Mac when executing these commands. Next, we will run a command using “sudo” or “Super User DO.” This elevates the command to the highest administrator level.You can find it by pressing Command + Space and then searching for “Terminal”. This forces your browser to get fresh information from the DNS server: You can “flush” the DNS cache, which means erasing it. If the IP address has changed or the server on that specific address is down, your DNS cache now points to the wrong place, and the website won’t load. Websites you visit often or have visited recently have their IP addresses cached so that the next time you see them, the browser goes straight to the server instead of querying the DNS server first. The DNS cache lists website addresses and their related IP addresses. One of the most common issues is a DNS cache that’s become corrupted or outdated. You can open Spotlight search by pressing Command + Space. Open the Activity Monitor by searching for it in Spotlight Search.This can lead to weird network behavior, which includes DNS errors when trying to browse websites. Hundreds of devices, apps, and macOS features rely on mDNSResponder to function correctly, but sometimes the process goes wrong. This little piece of software has an important job: it looks for devices on the network that use Apple’s Bonjour zero-configuration network protocol. If you open the macOS Activity Monitor, you’ll see a process called “mDNSResponder” as one of the many programs running in the operating system’s background. This should eliminate DNS issues caused by any bugs known to Apple. Alternatively, if you’re ready for a significant upgrade, update to the newest version of macOS that your Mac hardware supports. ![]() Whether this is an issue with specific versions of macOS, it’s a good idea to update to the latest version of the macOS edition you’re running. For example, it seems that macOS Big Sur, in particular, has a DNS issue that pops up randomly. We’ve also seen online forum posts indicating that DNS issues on macOS computers are more familiar with a specific version of macOS than others. Alternatively, switch your Mac to a different connection (e.g., your iPhone hotspot or Ethernet) and see if the problem persists. The fastest way to check if the problem is with something other than your Mac is to open the same web page on a different device connected to the same network. If you have this feature, you may also want to reset your ISP connection remotely.īefore you start poking around your Mac, you must narrow the problem down to your computer, or you’ll waste your time and potentially mess things up further. Some internet service providers allow subscribers to reset the ISP connection remotely through a website or mobile app dashboard. Restart any satellite mesh units, extenders, and repeaters. Restart your modem (e.g., your fiber ONT, cable box, etc.) and your router (if it’s a separate device). As such, restart all of the devices in the chain. While browsing without them, be extra careful about what websites you visit and what you download.The standard advice to reboot things applies more than ever to DNS issues since often it’s a problem with the internet connection that needs to be resolved. ![]() Note: Remember that both VPNs and firewalls are designed to keep you safe online, and removing them can leave you at risk. ![]() If you're using a third-party antivirus program, you might need to disable that app's firewall too. You might need to click the lock icon in the bottom-left corner first. Click Firewall at the top, then select Turn Off Firewall. On a Mac, open the System Preferences app and select Security & Privacy. In Windows, you can disable the default firewall by searching for Windows Defender Firewall, then selecting Turn Windows Defender Firewall on or off. You can also open the Network settings on your computer and disable all VPNs from there. This isn't as common, but if there's something standing between your computer and the open internet - say, a VPN or firewall - you can run into DNS issues.Įvery VPN has a different method for turning it off, but look for a Disconnect option in the settings.
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