WiFi and Firefox can connect, but no Windows system app can connect
I have a strnage problem, and I think that there must be an easy answer. But I can't find it through googling. Many thanks for help:
1. Windows 10, latest updates. Windows defender, all Antivirus turned off.
2. I can connect to the Internet via WifI with my browser firefox. Also, thunderbird works fine.
3. However: All programs that work through standard windows options cannot cannot: Chrome, Edge, Dropbox. No connection.
-> It must be sth with the windows settings.
4. What could this be? No proxies.
Unfortunately I cannot trace the problem to any new installation etc..
Thanks for your help..