I've never seen such thing before.
In ubuntu 18.04 LTS almost after 6 months, I have problem in loading HTTP urls in Firefox, Chrome even by wget. But I have no problem with same urls in HTTPS mode. Ping also works for the same urls.
However this problem not seen in other devices connected to same network!
Any help appreciated...
Update I have a solution for this that's not intresting (actually headache):
In firefox from
Preferences > privacy > View Certificates > Delete All Server Certificates.Reboot the Ubuntu 18.04
- For limited time everything working fine, but after visiting one of my websites with SSL (https), all urls with http stop working!
I think this problem related to websites with self-signed certificates, however these websites doesn't have similar problems in other devices.
Hope somebody knows the reason...
Updated: Today I faced with another strange issue.
I've setup Wifi hotspot using my Android mobile with 4G data network & my laptop conncted to mentioned hotspot.
Everything worked fine, but changing hotspot to USB tethering caused http stopped working.
By switching back to hotspot the problem gone!