Hi , I have removed the Listener(GSMIDBLPRD) and now using Mirroring. Now its working. I am using GSMIDBSQLPRD01;MIRROR=GSMIDBSQLPRD02 as Instance while registering database to ArcGIS Server. (GSMIDBSQLPRD01 & GSMIDBSQLPRD02 are two database server) I have also tried upgrading ArcGIS with latest version 10.2.1 from 10.2. and surprisingly i was able to register database with Listener name only. Now i am not sure if 10.2 does not support Listener name as instance or there is any other issue while registering database. would like to have some input on this. Thanks. Saurabh
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