LB in front of IWA IIS servers

Hi,
We have configured IWA authentication scheme with OAM 10g. For this, we are using 2 instances of IIS 7 server. Both of these IIS servers are on 2 different physical machines and have been configured for IWA.
Now to achieve HA, we have deployed a Cisco LB in front of these 2 IIS servers.
In OAM IWA authentication scheme, we have given LB hostname for IWA server.
Now when we make a request for IWA protected resource, the request is passed on to IIS server from LB but after that, nothing happens.
Is there anything we need to do at LB configuration to resolve our issue ?
Thanks

To provide my inputs, please respond to below queries:
Are you getting any error when you access IWA protected resource ?
What is the response it gives ?
Note: Make sure you have added LB URL to Local Intranet zone in IE browser settings.
Thanks
GK

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Modified your code on the line:
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