@Veerendra Nath Jasthi
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Not sure I am following your question. The UI displays the user which is currently authenticated in to the UI.
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Are you not expecting to see "CN=niifiadmin, OU=HORTONWORKS"? What are you expecting to see?
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What forms of user authentication are you configured to use?
User/client certificate? <-- User name displayed in upper right comes from DN in user/client certificate
LDAP authentication? <-- User name can come from user DN in LDAP (USE_DN) or username entered in login window (USE_USERNAME)
Kerberos authentication? <-- User name comes from user entered principal. <user>@<domain> (so pretty sure you are not using kerberos for authentication.)
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Thanks,
Matt