Github user VipinRathor commented on the issue:
https://github.com/apache/zeppelin/pull/2331
Thanks @felixcheung for spending time on this and approving.
> but we should fix it to lower case always just to be safe?
As per Shiro
[doc](https://shiro.apache.org/static/1.2.4/apidocs/org/apache/shiro/realm/ldap/JndiLdapContextFactory.html)
and JNDI LDAP
[doc](https://docs.oracle.com/javase/tutorial/jndi/ldap/auth_mechs.html), the
acceptable values are 'none', 'simple', 'SASL' or 'DIGEST-MD5' etc. So
converting AuthenticationMechanism value to lower case might not be a good idea.
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