2300104 - JCO_ERROR_RESOURCE: Connection pool WEBADMIN is exhausted error in Self Diagnosis

You run Self-Diagnosis for Managed System and run into below error:

"JCO_ERROR_RESOURCE: Connection pool WEBADMIN001|EN|AS=[localhost|$$|] is exhausted."

SAP Solution Manager 7.10

JCO_ERROR_RESOURCE, JCO, ERROR, RESOURCE, Warning: Thread.stop(): Thread.stop() called using java.lang.ThreadDeath in com.sap.engine.services.rmi_p4.P4ObjectBrokerClientImpl.close , KBA , SV-SMG-INS-DIA , Configuration of Root Cause Analysis related infrastructure , SV-SMG-DIA-SRV-CHK , Self Checks , Problem