I believe the following link identifies the location of this file: FMP installer does not install server.pem file
It's a bug report link of a bug that can be fixed by replacing the PEM file.
That report 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
Thanks for that. I decided to download the FMP11 trial and copied the server.pem & root.pem files to FMP8 installation folder. Fired up FMP8 and everything is working now.
Using the server.pem file from the FMP 11 trial resolved the issue for us. Not sure how the file became corrupt on three of our PCs, but the solution posted here worked great. Thanks :)