Need help on "org.postgresql.util.PSQLException: FATAL: terminating connection due to administrator command"

Hello,I'm using JSP for accessing postgre
My postgre version is 8.1 running on suse enterprise 10 linux machine.
My JSP container is Apache Tomcat 5.5.
My connection method is JNDI(pooling).
Recently I'm having trouble after my web application is being accessed by
many users.
My error log shows something like this :
======================================
...
org.postgresql.util.PSQLException: FATAL: terminating connection due to
administrator command
org.postgresql.util.PSQLException: FATAL: terminating connection due to
administrator command
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(
QueryExecutorImpl.java:1525)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(
QueryExecutorImpl.java:1309)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java
:188)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(
AbstractJdbc2Statement.java:452)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(
AbstractJdbc2Statement.java:340)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(
AbstractJdbc2Statement.java:239)
at org.apache.tomcat.dbcp.dbcp.DelegatingStatement.executeQuery(
DelegatingStatement.java:205)
at org.diknas.sarpras.UtilDiknas.executeQuery(UtilDiknas.java:226)
at org.apache.jsp.modul.monitoring.gofoto_jsp._jspService
(gofoto_jsp.java:157)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.jasper.servlet.JspServletWrapper.service(
JspServletWrapper.java:334)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:173)
at org.apache.catalina.core.ApplicationDispatcher.invoke(
ApplicationDispatcher.java:672)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(
ApplicationDispatcher.java:463)
at org.apache.catalina.core.ApplicationDispatcher.doForward(
ApplicationDispatcher.java:398)
at org.apache.catalina.core.ApplicationDispatcher.forward(
ApplicationDispatcher.java:301)
at org.diknas.sarpras.monitoring.MonitoringFotoProcessor.doEntryView(
MonitoringFotoProcessor.java:115)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(
NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(
DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.diknas.sarpras.monitoring.MonitoringFotoProcessor.doSelection(
MonitoringFotoProcessor.java:96)
at org.diknas.sarpras.monitoring.MonitoringFotoProcessor.doProcess(
MonitoringFotoProcessor.java:54)
at org.diknas.sarpras.monitoring.MonitoringProcessor.doFotoView(
MonitoringProcessor.java:133)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(
NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(
DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.diknas.sarpras.monitoring.MonitoringProcessor.doSelection(
MonitoringProcessor.java:91)
at org.diknas.sarpras.monitoring.MonitoringProcessor.doProcess(
MonitoringProcessor.java:50)
at org.diknas.sarpras.Controller.doMonitoringEntry(Controller.java:143)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(
NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(
DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.diknas.sarpras.Controller.doSelection(Controller.java:97)
at org.diknas.sarpras.Controller.doGet(Controller.java:66)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(
StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(
StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
:105)
at org.apache.catalina.core.StandardEngineValve.invoke(
StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java
:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:869)
at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection
(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(
PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(
LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(
ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)
...
=======================================

It seems that the exception came from Postgre :
org.postgresql.util.PSQLException: FATAL: terminating connection due to
administrator command

What's this ? I've tried to googling around and found something about
resource limiter or something like that, but I don't seems understand the
solution.
Is there any straight forward solution for my trouble here ? Cause I got
really stuck here.
How to configure postgre to fix this ?

thanks.