Solved! Go to Solution.
The .NET Extension Support mentioned above was the solution for me as well. I did not install the .NET Extension Support during the ArcGIS for Server install. To install go to control panel, programs and features, double click on the ArcGIS for Server, choose modify and install .NET Extension Support. Here is a good forum that explains it well. http://forums-old.arcgis.com/threads/94186-10.1-SOE-error-ClassFactory-cannot-supply-requested-class
I also installed older versions of .NET Frame Works (versions 2, 3, 3.5 and 4).
Problem: Could not publish a map services with SOE extension capabilities enabled.
Errors I received:
Thanks guys. I'll be getting into this again shortly (probably after I've got the 10.3 server upgrade figured) so I'll give it a whirl..