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This knowledge base article applies to Customer-Hosted installations only.  You may encounter an issue where you type in the URL for the mobile web site (generally http://<your-servername-or-ip>/mobile, http://<your-servername-or-ip>/eioboard/mobile, or http://<your-servername-or-ip>:801/mobile).  Instead of being directed to the mobile web login page, you are directed to the full blown web login page.  If you inspect your Event Viewer logs on the server, you may see the following error:

Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 3/26/2014 11:31:19 AM
Event time (UTC): 3/26/2014 4:31:19 PM
Event ID: e981a2a0a5bc4398b788a18b057a44a3
Event sequence: 2
Event occurrence: 1
Event detail code: 0

Application information:
Application domain: /LM/W3SVC/1/ROOT-2-130403250776037932
Trust level: Full
Application Virtual Path: /
Application Path: C:\Program Files (x86)\Savance\EIOBoard Server\EIOBoard\
Machine name: EIEIOBoard

Process information:
Process ID: 11732
Process name: w3wp.exe
Account name: NT AUTHORITY\NETWORK SERVICE

Exception information:
Exception type: HttpException
Exception message: Session state has created a session id, but cannot save it because the response was already flushed by the application.

Request information:
Request URL: http://www.eioboard.com/Login.aspx?ReturnUrl=An unhandled exception has occurred.fDefault.aspx
Request path: /Login.aspx
User host address: 192.168.1.1
User:
Is authenticated: False
Authentication Type:
Thread account name: NT AUTHORITY\NETWORK SERVICE

Thread information:
Thread ID: 5
Thread account name: NT AUTHORITY\NETWORK SERVICE
Is impersonating: False
Stack trace: at System.Web.SessionState.SessionIDManager.SaveSessionID(HttpContext context, String id, Boolean& redirected, Boolean& cookieAdded)
at System.Web.SessionState.SessionStateModule.CreateSessionId()
at System.Web.SessionState.SessionStateModule.DelayedGetSessionId()
at System.Web.SessionState.SessionStateModule.ReleaseStateGetSessionID()
at System.Web.SessionState.SessionStateModule.OnReleaseState(Object source, EventArgs eventArgs)
at System.Web.SessionState.SessionStateModule.OnEndRequest(Object source, EventArgs eventArgs)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)


Custom event details:
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

This is caused by the IIS Server losing the session ID, which can be caused by a number of different reasons.  To resolve this issue, a Global.asax file can be added to store the session ID to a variable.  The Global.asax file needs to be placed in the root directory of the EIOBoard application.  It isn't created by default when installing EIOBoard, as it is an optional file, so it would need to be created manually with a text editor with the following content:

<%@ Application Language="C#" %>
<%@ Import Namespace="System.Diagnostics" %>

<script runat="server">

    void Session_Start(object sender, EventArgs e) 
    {
        // Code that runs when a new session is started
        string sessionId = Session.SessionID;
    }

</script>

Once the file is saved, restart IIS for it to take effect.  You should now have no trouble browsing to the mobile web login page in your web browser.