New user created as:
groupadd mygroup useradd -s /bin/bash -g myuser -m -k /dev/null myuser
When trying to log in:
[root@vserver~]# su - myuser su: /bin/bash: Permission denied
Solution:
[root@vserver~]# chmod 755 /bin [root@vserver~]# su - myuser [myuser@vserver~]$