SSO Login and Domino Name DB problem

Hi,guys: We have a domino server.the application on it is under sso protecting.The name db with the style below.

In User Name field we input three names:

1,domino name. such as : CN/OU/O

2,mail address. such as : user@mail.com

3,SSOID. such as : XXXXXXXX

while two or more domino users with duplicated name (same CN and same O,different OU.such as “a b/CC/domain” and “a b/DD/domain”),but different SSOID,one user loged in with his ssoid,the current user will be the duplicated user,not the user with the correct ssoid.It makes us much bothering.How it happened? How to resolve it?

Can someone with similar experience explain it for us.It is urgent for us.Thank you very much.

Subject: However resolved…

usernames must be unique, it means that if two users have the same SSOID only one will be able to login using proper password. Which one it will be, there is no rule, possibly the one whose person document is last modified.

Subject: RE: However resolved…

Thank you for your responding.In our issue, this problem often happened,not only one user.Usually while several duplicated users with different SSOID logged in, whoever he was,only one domino user they were.This user was not listed first in Name DB, and not created first.I did not know why all user logged in became him? how he was selected?

Forgot two things:first,our name DB was replicated from other server every day?did it affect the problem?

second, our server migrated from R5 to R6 short time before. on R5 server,no such a problem.

Is it due to migration?In R6 the name rule should be same?