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sql confusion

Quick question for you all:

I know ms sql uses tcp/1433 for connections, and i know that the enterprise manager also uses udp/1434 for discovery.  However I have found something odd at a customer site and wondered if anyone else had seen the same thing.

ASL 2.030
client machines are on 'internal' network
sql machine is on 'dmz' network

[internal tcp+udp/1433:1434 dmz allow] 
   does allow sql queries but does not allow sql enterprise management console

[internal all/1433:1434 dmz allow]
   allows both...

Any idea what sql is doing that doesn't qualify as either tcp or udp?  I checked the packet violation live logs and got nuthin...


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