I can not enter two different accounts on the same domain

I can not enter two different accounts with same username and on the same domain.

 

e.g.:

http://mysql.mysite.com , user: 'abc', pass: '123'

http://webftp.mysite.com , user: 'abc', pass: '456'

 

P.S.  The Program generally good, but a lot needs to be done. I set our calendar to check for three months as may be suitable for work. At the moment I can not use it. Thanks.