@JJ Meyer I've a HBase client application which exactly does the same as your code but for some unknown reason Kerberos authentication fails with this exception "GSS initiate failed [Caused by GSSException: No valid credentials provided (Mechanism level: Failed to find any Kerberos tgt)]". I get this exception only when Kerberos ticket cache is empty but if I do a "Kinit" for my principal before starting the application it runs fine. This indicates Krb5LoginModule's option useTicketCache is set to true somewhere but using "UserGroupInformation.loginUserFromKeytab(principal, keytabLocation)" internally creates a JAAS config which would have useTicketCache as false. What would be the possible reason for this behaviour? From where does my client is picking up useTicketCache as true? I do have a JAAS config file with useTicketCache as true in HBASE_HOME/conf but I'm not using this anywhere in my client application, would my HBase client dependencies pick this configuration? Please let me know what could be the possible reason for this. Regards, Niranjan ... View more