Unknown user name or password problem

Interbase 4.0

I have a lot of process may be 10 and they open and close the BD in random
 dial up access ).

When 2 process open the BD at the same time i have the message
"Cursor unknown" or "Unknown user name or password"
I think is 2 process at the same time but not sure !

If some body know why or have the same problem and fix it

let me know


Jean Pierre Weaner