jdbc adapter read 35 000 line data, got system error

read 1000 lines is OK.

But when XI read 35000 lines, got system error in RWB:

Transmitting the message to endpoint http://pidev:8000/sap/xi/engine?type=entry using connection JDBC_http://sap.com/xi/XI/System failed, due to: com.sap.aii.af.ra.ms.api.RecoverableException: java.io.IOException: Error writing to server.

DB is informix.