1. first check if u can connect to the database locally, ( NOT FROM THE CLIENT). try c:\sqlplus username/password2. Ensure that the LOCAL and TWO_TASK environment variable are not defined 3. The database installation may have failed to make a registry entry for ORACLE_SID. Try adding the string value ORACLE_SID and modifying its data to the proper sid name. Verify that ORACLE_HOME and ORACLE_SID are entered into the registry properly in HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\HOMEx. The bequeath adapter attempts to connect to the default ORACLE_SID in the default ORACLE_HOME.
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