ODBC - RDO - SQL

Hi,

Actually, I have application in Visual Basic 6, DataBase SQlServer, And the
Connection is with RDO. I have been testing over It and I run the
application in three computers with the same user (created previously in the
application and SQl), sometimes the user works normally, and others times
the application shows an error where says: "Cannot connect to Database".
Today I tryed to connect with other user and was fine.

My question is: The ODBC has a problem with the connection when is the same
user. The ODBC limits a user only to connect once or may be for RDO
connection.

Thanks for your help.