multisite- cant log into sub-sites

I have talked to 3 representatives and no one could help me log into sub sites created in the multisite plugin. The representatives confirmed the configuration was correct but could not remedy the problem. Please help i keep getting
Forbidden
You don't have permission to access / on this server.
Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.
when i use the link provided in my email.