we use sophos on our clients, win7.
also use webfiltering software that uses a local proxy server at our main site and softwatre locally on machines outside of HQ.
2x weeks in sucsession we have lost internet for about 1-2hrs sae day of week.
i have disabled sophos, webfiltering and local proxy at both sites but i am still getting isses with the internet. intermittant though, only some sites not showing content and some sites not displaying at all..
i think its either firewall (managed by 3rd party) or DNS with our ISP.
last week the managed co said no changes were made to the firewall.
How can i prove this?