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Event ID: 14149 Source: MicrosoftWebProxy

Level
Description
Web Proxy service failed to listen to <ip address> port 80. The network interface card might not be functional. The error code specified in the Data area of the event properties indicates the cause of the failure.  For more information about this event, see ISA Server Help.
Data:
0000: 41 27 00 00
Comments
 
I had this problem when the "Publish Auto Discovery Information" checkbox was selected. Therefore, the ISA server was listening to port 80, and since IIS started before ISA, ISA was unable to bind to that port. The mentioned checkbox is situated in the properties of the ISA server.
The Web Proxy service is unable to register itself to listen on the port specified. Some other application might be using the port. See the link to ISA event 14149.

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