# Troubleshooting connection with the ODBC driver
Troubleshooting

**Note**  
If the username and password is already specified in the DSN, do not specify them again when the ODBC driver manager asks for them.

An error code of `01S02` with a message, `Re-writing (connection string option) (have you specified it several times?)` occurs when a connection string option is passed more than once in the connection string. Specifying an option more than once raises an error. When making a connection with a DSN and a connection string, if a connection option is already specified in the DSN, do not specify it again in the connection string.