I have installed QGIS Server through OSGEO4W. I followed the instructions by Anita Graser, as well as the instructions on this page but still keep getting a 500 Internal Server Error. The objective was to install a localhost instance to work with QGIS Server in a workshop environment.
What is peculiar is that in a group of 13 laptops running Win7, 4 loaded fine (with the odd 500 error).
Is there anyone who has managed to overcome this? I copied the dll files into the QGIS Server folder, changed the filename to remove the .exe from the filename qgis_mapserv.fcgi.exe, and then added it back on again. Every change I made, I restarted the apache server, but no change to the end result. Is it perhaps an install issue, which is making this impossible to troubleshoot?