There are several possible reasons why admin might want to restrict access of a member or group of members that have a certain 'status' and this can be done under the portal settings as follows:
Click on “Portal Setting” in the Menu
Click on ”Access”
Under the members of the group you want to restrict, Select “Status” (Note:You can select more than one by Hold Down Shift and click on the status you want to restrict)
You can also restrict selected User by adding the User ID in “Block/Ban Specific Users From Accessing Portal” located in the middle far right of the workspace.
Click “Update Settings”