Hi,
· Were you able to connect internet without any issues earlier?
· Did you make any changes to the computer prior to the issue?
· Is there any security set to access the network?
Let’s follow the steps provided below and check if that helps:
For DNS server follow the below steps and check for any errors listed in event viewer–
a. Click Start. Type cmd in the Start Search box, and then press ENTER.
b. At the command prompt, type the following command, and then press ENTER:
ipconfig /flushdns (there is a space between ipconfig and / )
It will show the message successfully flushed the DNS resolver cache.
Hope this information is helpful.