Hi...Hopefully I can describe this well enough. The specifics: Network with about 300 users, 12 switches for distribution (Unifi), Unifi wifi throughout building, onsite Unifi controller, Xfinity ISP with static IP, Sonicwall firewall, Unifi core, and Server 2016 for AD and DNS.
Only on domain joined computers the internet (including pinging) will timeout for random pages. In other words, I can go to ESPN.com no issue, go to Google.com with no issue, but then try Amazon.com and it will time out. Eventually, Amazon will appear and work. Usually getting to a page makes it better for the immediate time, but the next day or after a period of time things return to the same randomness. Using ICMP (ping) it is the same....time out, time out, then finally it will respond. This is different on each computer and very random.
Changed to static DNS (8's and 9's and ISP) on a domain joined workstation, essentially skipping the DC/DNS on prem server. Still same results with the time out. Other computers on the same network that are not domain joined (students or chromebooks) all work as they should with no timeout issues at all.
Any thoughts would be helpful!
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