Specific websites do not open on any browser. I have already tried to disable McAfee firewall, tried changing proxy on edge, chrome but still unable to access the sites. Below is the error:
This site can’t be reachedwww.icicibank.com unexpectedly closed the connection.
Try:

Checking the connection
Checking the proxy and the firewall
Running Windows Network Diagnostics
ERR_CONNECTION_CLOSED

I have reached out to McAfee, Microsoft to resolve the issue but they were unable to give a resolution and both informed this isnt an issue with their software. Hence now I approach Dell.