Issue: Following installing FileMaker Pro 8.5 on Windows XP, after attemping to enable TCP/IP access, the following error message appear:

“FileMaker cannot share or be a client of a file because a networking stack could not be initialized”

Resolution: Please check to make sure that your server.pem file [located in the root folder of where FileMaker Pro/FileMaker Pro Advanced, i.e. C:Program FilesFileMakerFileMaker Pro] is around 5 KB.

If it’s any smaller than that, then chances are that file is corrupt and can cause this error message to appear.  You may be able to copy the server.pem file from a working FileMaker Pro computer to the computer exhibiting the issue and test. Reinstalling the application should also create a non damaged server.pem file.

Link to FileMaker Forum