ERROR to install the plugin (openshift)

When I try to install the plugin "openshift", it returns the following error:

forge install-plugin Connecting to remote repository https://raw.github.com/forge/plugin-repository/master/repository.yaml... **ERROR** [forge install-plugin] peer not authenticated.

This I tried from the forge plugin of JBoos Studio 5. It is important to tell you that I am not conected with a proxy, the conection is direct.