"RPC Server Is Unavailable" Error Message When You Connect to NLB Cluster Host Through NLB Manager (291959)
The information in this article applies to:
- Microsoft Windows Server 2003, Enterprise Edition
This article was previously published under Q291959 SYMPTOMS When you attempt to connect to a Network Load Balancing
(NLB) cluster host from another cluster host by using NLB Manager, you may
receive the following error message: The RPC server is
unavailable Connections through NLB Manager to an NLB cluster host
from non-cluster hosts are successful. Only those connections initiated
from other cluster hosts are unsuccessful. CAUSE This behavior occurs because cluster hosts contain only one
network adapter, and cluster hosts function in unicast mode. This functionality
is a limitation of the single-network-adapter unicast NLB
configuration. For additional information about these
limitations, click the article number below to view the article in the
Microsoft Knowledge Base: 197999 Single Network Interface Card Limitations with WLBS
RESOLUTION To work around this issue, use any of the following
methods:
- Run NLB Manager from a non-NLB cluster host.
- Enable multicast on the NLB cluster.
- Add an additional network adapter for host-to-host
communications.
Modification Type: | Minor | Last Reviewed: | 1/20/2006 |
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Keywords: | kbenv kberrmsg kbprb KB291959 |
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