Powershell Remoting through Load Balancers : The "select or value was not found" problem


Powershell remoting is supported over load balancers with configuration described at http://msdn.microsoft.com/en-us/library/ee309370(VS.85).aspx#load_balancing_in__the__iis_extension_hosting_model


 


Users when trying to use this feature may hit a problem that breaks an active runspace with an error that looks like the following:


 “the select or value F8037657-C31F-4B2F-9BCA-CAD89BC7C9F1 specified in the request was not found.


 


The above error ideally means that the runspace does not exist or has already expired. However, users may hit this even when the remote runspace is active in a load balancer scenario. This will happen when winrm (the underlying transport protocol) uses multi-handshake auth protocols like Kerb, Negotiate or CredSSP. 


 


There were two workaround to this issue:


– Configure LB to explicitly set the outbound cookie on every response (the default behavior is to set only on the request that did not have any cookie set)


– Adding a custom HTTP module on the IIS endpoint to replays back the cookie on every response

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