Issues while JDBC System Object Creation for accessing MS SQL 2000 Server

Dear Experts,
I am creating system object to connect to MS 2000 server in Ep 7.3
1) created system with all the properties
2) User mapping done
3) permissions ok
but still while testing connection its giving error
"No connection to system DBSQL found:
com.sapportals.connector.connection.ConnectionFailedException: Connection Failed: A nested exception occurred. Could not initialize physical connection.
Connection Failed: A nested exception occurred. Could not initialize physical connection.
Connection Failed: A nested exception occurred. Could not create JCO connection.
'user' missing"
""" Connection Test for Connectors:
Test Details:
The test consists of the following steps:
1. Retrieve the default alias of the system
2. Check the connection to the back-end application using the connector defined in this system object
Results
Default alias retrieved successfully
Connection failed. Make sure user mapping is set correctly and all connection properties are correct. """"

Dear Mr. Arun,
thanks for the valuable sap note
I have applied the note but same result :
No connection to system DBSQL found:
com.sapportals.connector.connection.ConnectionFailedException: Connection Failed: A nested exception occurred. Could not initialize physical connection.
Connection Failed: A nested exception occurred. Could not initialize physical connection.
Connection Failed: A nested exception occurred. Could not create JCO connection.
'user' missing
1) i have created JDBC Driver as mentioned in sap note
2) created System object
3) created destination as required in EP 7.1 and above
4) mapped user in user administration
when i am testnig connection its giving above mentioned error
same system object when i am creating for EP 7 its working fine with all 3 jar files and system creating succesfully
plz help

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