Can't connect to office network with Lion but I can with Snow Leopard

I am trying to access my office network (time capsule) via the office IP address from my MacBook Pro (Mountain Lion OS). When I enter the IP address via Go => Connect To Server... I get the message: "this file server will not allow any additional users to log on". I tried logging on with my wife's iMac (Snow Leopard) and it connects just fine, so I know it must be a problem with Mountain Lion or something simple that I don't have activated on my MacBook. Please help, this is very frustrating. Thanks in advance! 🙂