Sonarqube password

authentication failed of username and password. I enter as a user but I can’t enter as admin. I find administration in an the image. i try to enter new password. the mesage is the request can’t be processed. i don’t use database.
windows 10
version 9.5
java 11

Plz help me plz

What do the logs say?

Where 's logs in site?

There in the /logs/ directory of your SonarQube installation directory.

i leave site for long. after that site don’t start, i begin start sonar again. i can’t login as admin again. i enter as new admin. this means that data is lost?