A user is having issues connecting to the Internet through a web browser; however, the user is receiving email and instant messages. Which of the following should the user do to BEST resolve the issue

Validating the certificate is related to secure website (HTTPS) connections, but it wouldn't prevent access to all websites and wouldn't be the first step if email/IM work.

If email and instant messaging work but web browsing does not, it indicates that the underlying network connection is functional, but the web browser's ability to connect to external sites is impaired. Incorrect proxy settings commonly redirect or block web traffic specifically for the browser, while other applications using different protocols (like email) might bypass the proxy or use different settings, hence remaining functional.

Disabling a pop-up blocker only affects the display of pop-up windows and does not prevent a browser from connecting to the Internet.

Clearing the browser cache can resolve issues with loading specific website content, but it's unlikely to completely prevent all web browsing while other internet services function normally.