Issue:
In some classes (primarily in one room, although it has happened in another room) 1-10 pupils are randomly blocked from accessing websites. They can browse for something but whenever they click on a website, they get a 'site cannot be reached' with an err_proxy connection failed message. Only websites that work are teams and MSN.
Temporary solution: delete user profile
We noticed that if we run chrome as an admin, internet works fine, this doesnt work on Edge however. Also, if we move the pupil to another computer, it works (although, sometimes the issue comes back).
What we tried:
-ipconfig flushdns
-ipconfig release renew.
-deleting computer from sophos and then reimaging
-unticking, 'Allow the computer to turn off this device to save power' on the network adapter settings
-reimage
-windows updates
-I tried adding the IP address to the exclusion range on DHCP
Extra notes:
-We don't think its a proxy server issue as we don't have one and we even tried tweaking those settings.
-I can ping google.com (from impacted machine) so its not DNS.
-No drivers missing
-Smoothwall is our web filter and we see no message on the realtime web filter.
-We have some group policies in place like folder redirection, so if they save something on their downloads or documents folder, it will save into their network personal drive instead of locally.
-Machines are relatively new (manufacturer: VeryPC), about 1 year and half old and we started having these issues since October when we started adding GPO's as we moved to a new domain to join the trust's schools. Which makes me think its that group policy issue but then why is it not impacting everyone. Is it the machine?
-We use abtutor and the teacher uses it a lot to apply policies. Not sure if this would impact it?
Thank you!