I had a weird situation where I had 3 PC and Oracle 10g Client is installed on them. I had installed one of the VB application on all three connecting to Oracle 10g DB. One PC is able to read the Service correctly and connect to the database while others are not THere is only One Oracle Home on them Sqlplus work fine in connecting to the Database and So TNS Service or alias are correct I tried to trace parameter in sqlnet.ora but found that only Sqlplus connection is only creating Trace file while there is no trace file created with VB Access which look like that it is not reading the Tnsnames. No Oracle errors except database does not exist I had also added TNS_ADMIN in environment pointing to OH/network/admin Any other suggestion TIA Sanjay --------------------------------- Food fight? Enjoy some healthy debate in the Yahoo! Answers Food & Drink Q&A.