I recently installed FM 11 on a Windows 8 machine which was on a Server 11 network. However, that machine, while able to see the host server, was not able to see the hosted files.
Uninstalled, reinstalled, rebooted etc etc and eventually, after finally resorting to FileMaker tech support, that for some reason, the server.pem file was not being created during the installation. Once this was copied from another machine, all was good.
Just a heads-up, in case this ever happens.