Impala jdbc connection drops intermittently

[#1]

Connecting to impala using one of the BI tools with jdbc string on port 21050

The connection is successful but drops intermittently for some time with below error

java.net.SocketException: Connection or outbound has closed

The firewall is open, there is no network issue between two servers 

[#2]

Please check if you are using impala LB for the connection string or impala daemon.

[#3]

yes there is impala daemon used in connection string, how to tackle this error if it is caused due to daemon in connection string