Web Security Service (WSS)
Unified Agent (UA)
You get a 'DNS_PROBE_FINISHED_NXDOMAIN' error message when you browse the Internet.
But the page does load if you try it several times.
This issue only happens when connected through the UA.
This site can't be reached
One cause of this issue is recent versions of Windows prefer IPv6 over IPv4 when the "Block IPv6 traffic" option is enabled in the WSS portal.
If the computer prefers IPv6, DNS queries are first attempted with AAAA DNS requests.
If "Block IPv6 traffic" is enabled in the portal, IPv6 DNS queries are blocked resulting in the error.
There are a few potential solutions to this issue. And it may require a combination of these to fully resolve the issue.