Problem
The Container you want to manage is inaccessible by its hostname or IP address.
Solution
iptables
service
inside the problem Container.
Note: Remember that each Container user with the privileges of an administrator exercises full control over his/her Container, has his/her own user credentials (name and password) to access the Container and enjoys an unlimited access to other user accounts inside this Container, i.e. s/he has any right granted to a privately owned physical server as opposed to the Hardware Node administrator's authority or the rights of the other Containers users in regard to the given Container. Any Container user can be a member of an Active Directory domain (e.g. access any of the network shares to which the Container user has rights).