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Error : Network Adapter could not establish the connection ..

Issue :-

I had a Virtual machine on which i was running my OAM suite of products. Once I changed my static IP to dynamic IP i was receiving "Network adapter could not establish the connection" when i started my Weblogic admin or managed servers. Database was installed on the same machine. My database was running and Listener was also up. It was a clear indication that my Weblogic admin and managed server were not able to connect to my Database which was up and running.

I tried to connect the same Database from another third party application and received below error.
"Listener supports no service"..

Resolution :-

After spending some time on this i found out a command which has to run on the database in order to link the Database service to the listener. Command is as below :
"Alter system register"

After running the command i restarted DB and listener and then started my Weblogic admin and managed server. servers started without any issue. 

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