The first part of troubleshooting is to find out if it is indeed your DNS that is the problem, or if you are just having problems connecting to a site. This can be quite easily done by issuing the ping command at the command prompt. For example:
If the site is live, then you will receive all of your packets. If not, you will get a response similar to the following:
Ping request could not find host.
Please check the name and try again.
This means that your DNS is not the problem and the site you are trying to access is down. If a site is live and you cannot connect to it with your browser, a DNS problem might be the cause. If you suspect a DNS problem, take the following actions:
In the following steps, OpenDNS is the example that your DNS address is changed to. However, OpenDNS isn't the only option out there, so feel free to choose another that is best for your needs or location. The reason to change your DNS address to OpenDNS or another option is that default DNS servers provided by ISPs tend to be slower because of promotional offers included in said servers or the ISP doesn't have good quality servers to begin with. OpenDNS, or another similar service, will not only be faster but any promotional offers that said ISP might try to spam you with or any phishing attacks will be blocked. Additionally, most of these services are free, so why not give it a try? If these services are not for you, you can always change back with no cost. Follow the following steps to change your DNS address (OpenDNS is just an example):
1. Open the Control Panel.
2. Open up Network and Internet and go to the Network and Sharing Center.
3. Click on adapter settings on the left hand panel.
4. This will bring up a list of adapters present on your computer. Most people will have a Local Area Connection, while laptop users will add a Wireless Network Connection and possibly a Bluetooth Network Connection. Right-click on Local Area Connection and click on Properties.
5. If prompted by UAC, click Yes.
6. Highlight Internet Protocol Version 4 (TCP/IPv4) and click on properties
7. In the properties window you will see a few radio boxes that say Obtain an IP/DNS Address Automatically. Leave the IP address alone and change the Obtain DNS server address automatically to the following:
(Here is where if you chose an option other than OpenDNS, your inputs and steps will differ from these)
In the Preferred DNS server boxes enter this sequence: 220.127.116.11
In the Alternate DNS server boxes enter this sequence: 18.104.22.168
8. Check validate settings upon exit, click OK and close to finish.
9. Windows will check your settings and you will be finished! Now start surfing and feel the effects of a quicker and more secure browsing experience.
After exhausting all of these options, it is time to get further help. Contact your ISP to use their support team, search the internet for your specific error for an easy fix, or contact us and we will be glad to offer the best support we can.