Weblogic Integration and Portal server instances on the same machine

Can we have an instance of weblogic integration server and the portal server instance running on the same machine simultaneously?

Here is my scenario.

I have a portal server instance running in the production mode. I want to start an integration server instance in the same machine in the production mode. But that instance threw some errors while starting and was shut down. So I created that instance in the dev mode and it started running correctly. But I started getting these error messages in the portal instance.

"
java.io.IOException: JMS JDBC store, connection pool = <cgJMSPool-nonXA>, prefi
 = <weblogic>: ping failed, database not responding
java.io.IOException: JMS JDBC store, connection pool = <cgJMSPool-nonXA>, prefi
 = <weblogic>: SQL exception
java.sql.SQLException: Connection failure. sendMethodRequest(...).
        at com.pointbase.dbexcp.dbexcpException.getSQLException()Ljava/sql/SQLE
ception;(Unknown Source)
        at com.pointbase.net.netJDBCPrimitives.sendMethodRequestByID(Lcom/point
ase/net/netJDBCConnection;Ljava/io/DataOutputStream;I[Ljava/lang/Object;)V(Unkn
wn Source)"

Any idea why this is happening?
thanks,
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