I am having the same issue. But both machines are Windows XP.
I have tried everything to solve it with no resolution in sight!!!
Here's the likely reason and a solution: FMP installer does not install server.pem file
This is one of many acknowledged bugs that can be found in the Known Bug List here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: http://www.4shared.com/file/8orL8apk/FMP_Bugs.html