You can disable a community, preventing all access to that community.
Log in to the Portal Administration Pages and click on the Communities tab.
Locate the community that you want to edit and click the edit link next to the community name.
Or, enter the Community Administration for the community and click the Community Settings tab.
The Community Settings Page opens.
To disable the community, set the Community Status option to Inactive.
Click Update.
The settings you have specified are applied to the community. If a user tries to visit the community, the portal will display a page that says this community is offline.