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Existing DNS issue resurfaced - WiFi Internet connection to safe websites blocked by Norton Core
This is an issue that plagued the Norton Core for several months last year - where Internet connection to several known safe websites was being blocked by Norton Core on my phone, and if WiFi was disabled, the connection was available to these websites.
The issue lies with the DNS settings of the Norton Core: if you keep the DNS setting to "Norton Secure DNS", then it blocks known safe websites (like local public libraries, Wikipedia).
If I switch the DNS settings to "ISP's DNS", then the Internet over WiFi works as it should.
Norton/Symantec struggled with this issue for several months last year, until they finally put in a fix. Looks like that fix has been "unfixed" now.
More details on this old closed thread - https://community.norton.com/en/comment/7784001#comment-7784001