On a terinal or remote dekstop server there are various applications that yuo will not want a remote desktop user to run, regedit is one of them Here is how to stop a standard user from running regedit in terminal services.
On a fresh Exhange 2013 install you cannot log into the ECP/EAC and receive the error Server Error in ‘/owa’ Application. The Active Directory user wasn’t found.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.