can not connect internet with minecraft launcher

Minecraft launcher lost connection....

What I expected to happen was...: Actually connection lost...

*What actually happened was Despite having an internet connection to the computer itself, the Minecraft Launcher says "Please check your connection and try again." I get this error over and over again, restarting my router, and leaving it alone for a few days. It has been several days since I can no longer do it. There is no sign of healing at all. Recently, Minecraft account security warnings have also been issued and have been banned by hypixel. Something is wrong. I think something went wrong after changing my username to "Microsofted". Is this a problem for my account? Help me. . . . . . . .

Steps to Reproduce:
1. Open minecraft launcher
2. Write my e-mail address and password
3. Click [LOG IN]
4.Looks like the picture