Can you create a shortcut link on another machine and put that on the Win 8 machine? Clicking on the shortcut should (emphasis on should) open the hosted database for you. This will help eliminate possible issues.
What version of filemaker pro?
Any error message?
Have you right clicked filemaker and chosen "run as administrator"?
Have you used a network tracking tool like wireshark to monitor and make sure port 5003 traffic is getting out?
It is the latest version of Filemaker Pro 11.
There are no error messages. It simply cannot find any remote servers (hosted databases on the local network don't show up), or list any files if a server IP address is hard-specified.
I haven't tried a network tracking tool as a] I'm not very familiar with such tools for Windows, and b] all other machines on the client's network can connect fine, and the affected machine itself can connect to other internet-type services such as webservers and mail servers.
I will ask them to try the 'Run as Administrator' option now.
I am also going to look into whether the version of Bonjour that Filemaker 11 installs is the correct one.
And we will also try David's suggestion of a shortcut.
there was an issue with older FM 11 installers were the server.pem file as either missing or corrupted.
Copy that file from a workstation where FM 11 can connect and see if that's the issue.
the server.pem issue usually returns an error message, stating that the network failed to initialize.
It sounds to me like something in windows 8 is still blocking the connection to filemaker. You might want to manually add filemaker (program) and 5003 (port) to the windows firewall to see if that helps. I know you stated they disabled it, but I think the firewall is deeper from the "trusted applications" perspective, which is why I suggested to try "run as administrator".
If it's a mission critical application, would it be possible to downgrade the user to windows 7?
This has fixed the issue, thank you