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When grouping multiple sites in the same app pool we have the following warning logged in the event viewer and the sites become unavailable.

Exception type: NullReferenceException

Exception message: Object reference not set to an instance of an object.
at Tridion.ContentDelivery.AmbientData.HttpModule.OnRequestStart(Object sender, EventArgs e)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Has anyone seen this before or have any advice I can try?

Any advice would be great.

When grouping multiple sites in the same app pool we have the following warning logged in the event viewer and the sites become unavailable.

Exception type: NullReferenceException

Exception message: Object reference not set to an instance of an object.
at Tridion.ContentDelivery.AmbientData.HttpModule.OnRequestStart(Object sender, EventArgs e)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Edit: Tridion Version 2011 SP1 H1
Windows Server 2008 R2
IIS7
.Net v4

Has anyone seen this before or have any advice I can try?

Any advice would be great.

When grouping multiple sites in the same app pool we have the following warning logged in the event viewer and the sites become unavailable.

Exception type: NullReferenceException

Exception message: Object reference not set to an instance of an object. at Tridion.ContentDelivery.AmbientData.HttpModule.OnRequestStart(Object sender, EventArgs e) at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Has anyone seen this before or have any advice I can try?

Any advice would be great.

When grouping multiple sites in the same app pool we have the following warning logged in the event viewer and the sites become unavailable.

Exception type: NullReferenceException

Exception message: Object reference not set to an instance of an object.
at Tridion.ContentDelivery.AmbientData.HttpModule.OnRequestStart(Object sender, EventArgs e)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Has anyone seen this before or have any advice I can try?

Any advice would be great.