How Do I Reset My DNS Server

How Do I Reset My DNS Server

If you're experiencing slow internet speeds, trouble accessing websites, or encountering error messages that mention DNS, you might need to reset your DNS server. This process essentially clears out cached information that your computer or router uses to find website addresses, and forces it to fetch fresh information. It's a common troubleshooting step that can often resolve a variety of internet connectivity issues.

Understanding DNS

Before we dive into the "how-to," let's quickly touch on what a DNS server is. DNS stands for Domain Name System. Think of it as the internet's phonebook. When you type a website address like www.google.com into your browser, your computer doesn't inherently know where that website is located on the internet. It sends a request to a DNS server, which looks up the corresponding IP address (a series of numbers that uniquely identifies a server) and sends it back to your computer. Your browser then uses that IP address to connect to the website's server.

Why You Might Need to Reset Your DNS Server

Several situations can lead to the need for a DNS reset:

• Website Unavailability: You might be unable to access certain websites, even though they are functioning correctly for others. This can happen if your local DNS cache has outdated or incorrect information.
• Slow Website Loading: If websites are taking an unusually long time to load, it could be that your DNS server is struggling to resolve addresses quickly.
• "Page Not Found" Errors: Errors like "This site can't be reached" or "DNS probe finished no internet" often point to a DNS issue.
• Malware or Viruses: Some malicious software can alter your DNS settings to redirect you to fake websites or block access to legitimate ones.
• Network Changes: After making changes to your network, such as setting up a new router or changing internet service providers, a DNS reset can help ensure everything is configured correctly.

How to Reset Your DNS Server on Windows

Resetting your DNS cache on Windows is a straightforward process using the Command Prompt. Here’s how:

1. Open Command Prompt as Administrator:
   • Click the Start button.
   • Type "cmd" in the search bar.
   • Right-click on Command Prompt in the search results.
   • Select Run as administrator.
   • If prompted by User Account Control, click Yes.
2. Execute the DNS Flush Command: In the Command Prompt window, type the following command and press Enter:

   ipconfig /flushdns

3. Confirmation: You should see a message that says, "Successfully flushed the DNS Resolver Cache."
4. Optional: Resetting Winsock (for more advanced issues): Sometimes, the Winsock catalog (which handles network socket requests) can become corrupted. You can reset this as well. In the same Administrator Command Prompt window, type:

   netsh winsock reset

   Press Enter. You'll likely need to restart your computer for this change to take full effect.
5. Restart Your Computer: For the changes to be fully implemented, it's a good idea to restart your computer after flushing the DNS.

How to Reset Your DNS Server on macOS

Resetting the DNS cache on macOS is also done through the Terminal application.

1. Open Terminal:
   • Click on the Spotlight search icon (magnifying glass) in the top-right corner of your screen, or press Command + Space.
   • Type "Terminal" and press Enter.
2. Execute the DNS Flush Command: The command you'll use depends on your macOS version.
   • For macOS Monterey, Big Sur, Catalina, Mojave, High Sierra, Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion, Lion:

     sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder

   • For macOS Leopard:

     sudo dscacheutil -flushcache

   You will be prompted to enter your administrator password. Type it in and press Enter. Note that your password will not be displayed as you type.
3. Confirmation: There usually isn't a specific confirmation message for this command on macOS, but if you don't receive an error, the command has likely executed successfully.
4. Restart Your Computer: While not always strictly necessary for a DNS flush, a restart can help ensure all network-related processes are refreshed.

How to Reset Your DNS Server on Your Router

Your router also maintains its own DNS cache. Resetting your router can clear this cache and potentially resolve broader network issues. The exact steps can vary slightly depending on your router's make and model, but the general process is as follows:

1. Access Your Router's Administration Page:
   • Open a web browser.
   • Type your router's IP address into the address bar. This is commonly 192.168.1.1 or 192.168.0.1. If you're unsure, check your router's manual or look for a sticker on the router itself.
   • You will be prompted to enter your router's username and password. Again, this information is usually found on a sticker on the router or in its manual.
2. Locate DNS Settings: Once logged in, navigate through the router's settings menu to find the DNS configuration. This might be under sections like "Internet," "WAN," "Network," or "Advanced Settings."
3. Change DNS Servers (Temporary): Often, the easiest way to "reset" your router's DNS is to temporarily change the DNS servers it's using. You can use public DNS servers like Google DNS (8.8.8.8 and 8.8.4.4) or Cloudflare DNS (1.1.1.1 and 1.0.0.1). Enter these new addresses into the DNS server fields.
4. Save and Apply: Save your changes.
5. Restart Your Router: Most routers require a reboot to apply network settings. You can usually do this through the router's interface or by simply unplugging the power cord for about 30 seconds and plugging it back in.
6. Revert DNS Settings (Optional): After your router has restarted, you can either keep the new public DNS servers (which can sometimes improve performance) or revert them back to the default settings provided by your ISP if you prefer.

Important Note: If changing DNS servers on your router doesn't resolve your issue, or if you're uncomfortable with these steps, you can also perform a full router factory reset. However, this will erase all your custom settings (like your Wi-Fi name and password), so be prepared to reconfigure your network afterward.

Frequently Asked Questions (FAQ)

How long does a DNS reset take?

Flushing your DNS cache on your computer (Windows or macOS) is almost instantaneous. You'll see a confirmation message, and the process is complete. Resetting your router can take a few minutes, especially if you include the time to reboot the device.

Why is my internet slow after resetting DNS?

It's highly unlikely that a DNS reset itself would cause your internet to become slower. In fact, it's usually done to *fix* slow speeds. If you're experiencing slowness after a reset, the issue is likely elsewhere, such as with your internet service provider, your router's hardware, or a problem with your computer's network adapter.

Can I reset my DNS server without restarting my computer?

On Windows, you can flush the DNS cache using the command prompt without needing to restart your computer. However, for some more advanced network resets like Winsock, a restart is recommended. On macOS, while the command executes quickly, a restart is often suggested to ensure all related processes are refreshed.

What's the difference between flushing DNS and changing DNS servers?

Flushing the DNS cache clears out old, potentially incorrect website address information that your computer or router has stored. Changing DNS servers involves telling your device or router to use a *different* DNS server (e.g., from your ISP to Google DNS) to look up website addresses. They are related but distinct troubleshooting steps.