dear experts
i have lapt top p3 500
and this computer dose not contain network card
so i use pcmcia card
and i install oracle 9i without pluging the network card
so..
when i tray to use sql without pluging the network card
the sql connect and there is no problems
but
when i conect my network card
and traying to connect to db with sql
:it gives me this error
ORA-03113 : end-of-file on communication channel

so can help me what to do plz

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ORA-03113end-of-file on communication channel 

Cause:An unexpected end-of-file was processed on the communication channel; bug could not be handled by the SQL*Net (two task) software. This message could occur if the shadow two-task process associated with a SQL*Net connect has terminated abnormally or there is a physical failure of the interprocess communication vehicle (that is, the network or server machine went down). 

Action:If this message occurs during a connection attempt, check the setup files for the appropriate SQL*Net driver and confirm SQL*Net software is correctly installed on the server. If the message occurs after a connection is well established and the error is not due to a physical failure, check if a trace file was generated on the server at failure time. Existence of a trace file may suggest an ORACLE internal error that requires the assistance of Worldwide Customer Support.