My mac connects to the Internet fine, but Sarfari, chrome, and Firefox will not work. Nor will programs that connect to the internet

This problem has been going on for a few days. my computer connects to the internet fine and runs fine, but none of my Internet browsers will work. I have deleted all my history, cache, cookies etc. For all browsers. I have also made sure that i have no proxies on and that no firewall is blocking my Internet. I have ran virus scans to look for malware and nothing comes up... I'm very confused.

For chrome I get errors like "err_socket_not_connected", "err_connection_closed", and "err_empty_response"

for safari it just says "safari can't open the page because safari can't establish a secure connection to the server"

please help me if you know anything! Thank you in advanced