@MEFTAH1997 Kindly share the zeppelin logs for the timeframe when login failed.
Also check if you are hitting the same issue as below.
https://community.cloudera.com/t5/Customer/ERROR-quot-org-apache-shiro-authc-AuthenticationException...
Solution:
To resolve this issue you can try the below steps.
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usermod -a -G shadow zeppelin
chgrp shadow /etc/shadow
chmod 040 /etc/shadow
rm -f /var/run/nologin
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