Hello,   Below exception is due to the Front_Service_Threads exhaustion. It will authenticate the user but does not start the session because there's no availability for another threads.   [Cloudera][ThriftExtension] (3) Error occurred while contacting server: ETIMEDOUT. The connection has been configured to use a SASL mechanism for authentication. This error might be due to the server is not using SASL for authentication.   I recommend to increase "--fe_service_threads" by default, it is set to 64.   Cloudera Manager > Impala > Configuration > search "Impala Command Line Argument Advanced Configuration Snippet (Safety Valve)" > --fe_service_threads=256 > Save and Restart Impala.   Thanks, Pradheep ... View more