Sitecore DMS errors when using the ASP.NET out-of-process session-state modes


The ASP.NET session-state supports several different options for storing the session data. Currently, the Sitecore DMS only supports the InProc session-state mode.  The session state mode must be set to “InProc” for Sitecore DMS to work properly.

If you try to use the "SQLServer" or "StateServer" session-state modes, it will result in an exception with the following message:
Message: Unable to serialize the session state.