NLB with CAS not working

20 pts.
Tags:
CAS
Client Access Server Role
IIS
Microsoft Exchange 2007
Network Load Balancing
NLB
Windows Server 2008
We have set up Network Load Balancing (NLB) on two Hub Transport/Client Access servers. (Windows Server 2008/Exchange Server 2007) When we go directly to either of the nodes, we can access OWA just fine. However, when we try to go to the new NLB cluster, by name or IP address, we get this: The page cannot be displayed The page you are looking for is currently unavailable. The NLB cluster name and IP are in DNS; nslookup works fine and we can ping it by name and IP address. What am I missing? We have followed several articles to the letter. They all have the same information and do not indicate the need for any additional configuration once the cluster is set up. Is there any configuration needed in IIS (or anywhere else) for this?

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Well, we got the NLB to work by connecting the second onboard NICs and setting it up as unicast.
That’s fine, but there is one configuration issue that doesn’t match the instructions.

The network settings for the NICs to be used for the NLB are supposed to be configured with IP address and subnet mask only, no gateway. However, we could not get it to work until we configured a gateway IP address on those NICs.

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  • Mdrewanz
    no need to configure a gateway on those NICs (NLB ones), please read the following article from the Microsoft Enterprise Networking Team: Balancing Act: Dual-NIC Configuration with Windows Server 2008 NLB Clusters This should fix your problem!
    report

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