[binc] Username and Password fail

Hello,

I have all the services running,
root@serv Maildir]# qmailctl stat
/service/qmail-send: up (pid 6645) 1166 seconds
/service/qmail-send/log: up (pid 6646) 1166 seconds
/service/qmail-smtpd: up (pid 6647) 1166 seconds
/service/qmail-smtpd/log: up (pid 6653) 1166 seconds
/service/qmail-pop3d: up (pid 6650) 1166 seconds
/service/qmail-pop3d/log: up (pid 6656) 1166 seconds
/service/bincimaps: up (pid 6654) 1166 seconds
/service/bincimaps/log: up (pid 6657) 1166 seconds
messages in queue: 1
messages in queue but not yet preprocessed: 0

My email client is having a username and password problem connecting to the
IMAP server
does any one know what i can try to fix this.