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Event ID: 9091 Source: MSExchangeSA

Source
Level
Description
NSPI Proxy listen port on transport Rpc/HTTP is being overridden by registry setting System\CurrentControlSet\Services\MSExchangeSA\Parameters\Rpc/HTTP NSPI Port. NSPI Proxy will listen on port 6004 on this transport.
Comments
 
A support forum described a condition when this event was recorded due to the fact that in IIS there were two sites configured for SSL and using the same TCP port, 443. Once this conflict was resolved (only one instance of SSL using TCP/443 can be assigned per IP address), the problem was fixed.

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