After fixing the ASPnet Error to give the possibility to my customer to use ECP and OWA (see old post). The Asp.net continue to fault as you can see.
We don’t have any explanation and no more time to spend to fix what I consider as a bug.
Log Name: Application
Source: ASP.NET 4.0.30319.0
Date: 4/30/2014 8:39:05 AM
Event ID: 1309
Task Category: Web Event
Exception type: MapiExceptionIllegalCrossServerConnection
Exception message: MapiExceptionIllegalCrossServerConnection: Monitoring mailbox  with application ID [Client=OWA] is not allowed to make cross-server calls from [SRVEXC01.xxxx.loc] to [SRVEXC02.xxx.loc] at Microsoft.Mapi.CrossServerDiagnostics.BlockCrossServerCall(ExRpcConnectionInfo connectionInfo, String mailboxDescription)