System.Runtime.Remoting.RemotingException
Could not resolve host 'loopback'

Description: HTTP 500.Error processing request.

Details: Non-web exception.
Exception stack trace:

Server stack trace: 
  at System.Runtime.Remoting.Channels.Tcp.HostConnectionPool.CreateConnection () [0x0002f] in <aea011614eff4224a52973f24bda4a03>:0 
  at System.Runtime.Remoting.Channels.Tcp.HostConnectionPool.GetConnection () [0x0009d] in <aea011614eff4224a52973f24bda4a03>:0 
  at System.Runtime.Remoting.Channels.Tcp.TcpConnectionPool.GetConnection (System.String host, System.Int32 port) [0x00056] in <aea011614eff4224a52973f24bda4a03>:0 
  at System.Runtime.Remoting.Channels.Tcp.TcpClientTransportSink.ProcessMessage (System.Runtime.Remoting.Messaging.IMessage msg, System.Runtime.Remoting.Channels.ITransportHeaders requestHeaders, System.IO.Stream requestStream, System.Runtime.Remoting.Channels.ITransportHeaders& responseHeaders, System.IO.Stream& responseStream) [0x00022] in <aea011614eff4224a52973f24bda4a03>:0 
  at System.Runtime.Remoting.Channels.BinaryClientFormatterSink.SyncProcessMessage (System.Runtime.Remoting.Messaging.IMessage msg) [0x00066] in <aea011614eff4224a52973f24bda4a03>:0 

Exception rethrown at [0]: 
  at (wrapper managed-to-native) System.Object.__icall_wrapper_mono_remoting_wrapper(intptr,intptr)
  at (wrapper remoting-invoke) System.Web.SessionState.RemoteStateServer.GetItem(string,bool&,System.TimeSpan&,object&,System.Web.SessionState.SessionStateActions&,bool)
  at (wrapper remoting-invoke-with-check) System.Web.SessionState.RemoteStateServer.GetItem(string,bool&,System.TimeSpan&,object&,System.Web.SessionState.SessionStateActions&,bool)
  at System.Web.SessionState.SessionStateServerHandler.GetItemInternal (System.Web.HttpContext context, System.String id, System.Boolean& locked, System.TimeSpan& lockAge, System.Object& lockId, System.Web.SessionState.SessionStateActions& actions, System.Boolean exclusive) [0x00025] in <c5b565d4ba9d44bfac3c5016d369d8a2>:0 
  at System.Web.SessionState.SessionStateServerHandler.GetItemExclusive (System.Web.HttpContext context, System.String id, System.Boolean& locked, System.TimeSpan& lockAge, System.Object& lockId, System.Web.SessionState.SessionStateActions& actions) [0x00008] in <c5b565d4ba9d44bfac3c5016d369d8a2>:0 
  at System.Web.SessionState.SessionStateModule.GetStoreData (System.Web.HttpContext context, System.String sessionId, System.Boolean isReadOnly) [0x00003] in <c5b565d4ba9d44bfac3c5016d369d8a2>:0 
  at System.Web.SessionState.SessionStateModule.OnAcquireRequestState (System.Object o, System.EventArgs args) [0x00054] in <c5b565d4ba9d44bfac3c5016d369d8a2>:0 
  at System.Web.HttpApplication+<RunHooks>d__217.MoveNext () [0x00144] in <c5b565d4ba9d44bfac3c5016d369d8a2>:0 
  at System.Web.HttpApplication+<Pipeline>d__225.MoveNext () [0x00771] in <c5b565d4ba9d44bfac3c5016d369d8a2>:0 
  at System.Web.HttpApplication.Tick () [0x00000] in <c5b565d4ba9d44bfac3c5016d369d8a2>:0 

在Web.Config中，明确指点StateServer的IP地址和端口。