Can you resolve google.com via the about:networking DNS Lookup tool ?

You can check the connection settings and check for possible issues with a Proxy or VPN service.

• Settings -> General -> Network: Connection -> Settings

If you do not need to use a Proxy to connect to internet, select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.

See also:

• https://support.mozilla.org/en-US/kb/connection-settings-firefox
• https://support.mozilla.org/en-US/kb/websites-dont-load-troubleshoot-and-fix-errors

Thank you cor-el, I used the about:networking page, DNS tab to clear DNS cache - that solved the problem, although I don't know how or why but it was the solution to my issue. Thank you so much. DougH

Hi cor-el, Solution worked ONCE - the next time I tried to access google calendar - problem returned. I cleared the DNS cache again and the calendar loaded ?? More advise needed please. I am not using any proxy or VPN that I know about, I use AVAST Premium protection, and run Ghostery as a Firefox extension - turning Ghostery on and off has no effect. I have tried the usual tricks - clear History Everything, uninstall and reinstall Firefox, etc.. Thanks, DougH

Further information: On my system: C:\Windows\System32>NSLOOKUP Default Server: mygateway Address: fe80::be30:d9ff:fee2:e2e0

NSLOOKUP google.com.au Server: google.com.au Addresses: 2404:6800:4006:804::2003

         172.217.24.35

DNS request timed out.

   timeout was 2 seconds.

DNS request timed out.

   timeout was 2 seconds.

• • • Request to google.com.au timed-out

Is that helpful ?? If I directly ask Firefox to go to 172.217.24.35 - google loads as normal, so ???? NOW WHAT ?? Regards, DougH