Imagine a situation where certain websites on your system aren’t working, however the Internet is connected (which is evident by other websites which are opening). The websites which are not working on your system could be working on other devices (eg. your phone). In this situation, it could be understood that the issue is with the system itself.
In such a situation, we could use two command line tools: ping and nslookup. We open the Command Prompt window after searching through Windows search and use these commands. Eg. ping <website name>, nslookup <website name>.
The ping command sends packets of information to the IP address or the domain and checks for replies. However, it does not lookup to the DNS, something which is done by the nslookup command.
Thereafter, proceed with the following solutions:
1] Flush DNS, reset Winsock and reset TCP/IP
2] Force Windows to do a DNS lookup by using FQDN
3] Use Google’s public DNS
4] Check the Host file to verify if the unreachable website has been blocked
5] Delete WLAN Profiles
6] Reinstall the Network Adapter drivers
7] Power-cycle the modem, router, and computer
Solution 1] Flush DNS, reset Winsock and reset TCP/IP
1] Search for Command Prompt in the Windows search bar and right-click on it. Select Run as administrator.
2] Type the following command and press Enter after each command separately to execute it:
ipconfig /flushdns netsh winsock reset netsh int ip reset resettcpip.txt
3] Restart the system once all the 3 commands have executed.
Solution 2] Force Windows to do a DNS lookup by using FQDN
1] Press Win + R to open the Run windows and type the command ncpa.cpl. Hit Enter to open the Network Connections window.
2] Right-click on your network and select Properties.
3] In the list, double-click on Internet Protocol Version 4.
4] In the Internet Protocol Version 4 Properties window, select Advanced.
5] In the DNS tab, shift the radio button to Append these DNS suffices (in order).
6] Click on Add.
7] In the Domain suffix, add a dot (.) and click on Add again.
8] Click on OK to save the settings and restart the system.
Solution 3] Use Google’s public DNS
1] Open the Internet Protocol Version 4 Properties window as explained in Solution 2.
2] Shift the radio button to Use the following DNS server addresses and change the entries as follows:
Preferred DNS address: 18.104.22.168
Alternate DNS address : 22.214.171.124
3] Click on OK to save the settings.
4] Restart the system and check if it helps.
Solution 4] Check the Host file to verify if the unreachable website has been blocked
The Host file is located at the path C:\Windows\System32\drivers\etc. While we might not make changes to it, installing a new application or a virus/malware could cause changes to the file. Open the Host file in Notepad and check what all sites have been blocked. The entry could be delete to unblock the website.
It is also advised to run a full system anti-virus and anti-malware scan if the Host file was modified.
Solution 5] Delete WLAN Profiles
1] Search for Command Prompt in the Windows search bar and right-click on the option. Select Run as administrator.
2] Type the following command and press Enter to execute it:
netsh wlan delete profile name=”<name of the network>“
Replace <name of the network> with the Network profile.
3] Restart the system.
Solution 6] Reinstall the Network Adapter drivers
1] Press Win + R to open the Run window and type the command devmgmt.msc. Press Enter to open the Device Manager.
2] Expand the list of Network Adapters and right-click >> Update driver for each Network Adapter one by one.
3] Restart the system to save the changes.
Solution 7] Power-cycle the modem, router, and computer
1] Switch OFF the modem, router, and computer.
2] Switch ON the modem only and let the lights become stable.
3] Now switch ON the router and let its lights become stable.
4] Finally, switch ON the computer.
5] Check if it resolves the issue.
We hope this exhaustive troubleshooting guide helps in resolving the issue.