Original User: crafty762
Thanks for posting the solution. I was initially wondering if your ArcCatalog issue and IE issue might be unrelated and thinking that one of the PCs might have a different ArcGIS Desktop software version than AGS while making an admin connection. For example, the error you showed can occur if you try to make an administrative AGS connection from a version of the software that's different than AGS (e.g., make an admin connection from ArcCatalog 10.2 to AGS 10.1). Clearly this wasn't the issue now that you posted the solution. Glad it's working for you!