for u who ever face invalid login when u want to login at qmailadmin interface, and vqadmin eror like cannot chdir to some domain in fedora/rhel base linux, maybe you find to disable selinux useful to solve that eror… you can disable selinux in time by invoking :
#setenforce 0
or if you want to disable selinux at next bootup then you need to edit /etc/sysconfig/selinux to like this :
SELINUX=disabled
but i inform you that two action is only to bypass selinux not to disabled it at all, so if you want to completely disable selinux the you need to pass parameter to kernel at boot, if you using grub then edit /boot/grub/grub.conf, add selinux=0 at kernel line, me like this :
kernel /vmlinuz-2.6.9-22.EL ro root=/dev/VolGroup00/LogVol00 selinux=0
after reboot, when u check your selinux status in the system it will print out like this:
[root@server config]# sestatus -v
SELinux status: disabled
[root@server config]#
after all of this i recommend your to read the FAQ about selinux at fedora: http://fedora.redhat.com/docs/selinux-faq/
good luck !!!