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Changes Caused Necessity to Restart Firewall

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Last Modified: 2012-05-11
Hello Experts,
Have a WHY question...  ASA Firewall with IDS.   Connections to External Internet, Internal DMZ Zone, Internal Router.  
The DMZ Zone has 3 servers.  2 dns and 1 web.   Over the weekend, Virtualized these 3 servers to one new server and disabled the switch ports of the 3 servers.  
Accessing a Test computer in the DMZ Zone,  tested accessibility to the new VS, DNS VS and Web VS  Everything worked Perfectly.   Access all websites from DMZ Web Server, and Outside Internet sites.
HOWEVER,  No Accessibility to Webserver from Outside World.  DNS Traffic Gets Thru.  Can Remote Desktop to all DMZ Servers from Management Network.    Everything execpt http traffic is not working.    "Server Not Available" is the Internet Explorer Error.  
After Hours of Troubleshooting finally shook my head and restarted ASA.   Now Everything works Perfectly and Everythign is Accessible.    MY Question .   What would cause the ASA to deny http traffic when I switch the 3 Servers to VS and upon restart allow traffic  ????
Hope I explained my case well.   Any Thoughts would be appreciated.
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