The Network Adapter could not establish the connection

[RichardDeray]

Hi,
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I use APACHE/TOMCAT 4.0 with ORACLE 8i on a PC/XP plateform.
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Occasionnally only, I have an error message from ORACLE : "java.sql.SQLException: Exception d'E/S: The Network Adapter could not establish the connection".
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This append only when I create many records in a loop (more than 200).
If I create 3000 records in 15 groups of 200 separated by 120 seconds of waiting time, all the records are created whithout any problem.
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When the server is not used during a ceratin number of hour this deconnection append.
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Could somebody help me.
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Thanks.