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Why would windows 2008 firewall start to block SQL

Last Modified: 2012-05-11
We have a Win 2008 x64 server running SQL 2008 std x64.  On Sat morning, we ran windows update.  After the server rebooted, none of our applications could contact SQL.  The update was KB982861.  Once I got the call this morning from our UK office, that the server was not responding, turning off the firewall restored connectivity to everything.  

Any idea why that update would affect the firewall and cause it to block inbound SQL requests?  It's been a operational SQL server for about 2 years now...
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