The common issue when we are rebuilding the standby through RMAN. Follow the below steps and resolve the RMAN 04006 error ...
(DESCRIPTION= (ADDRESS=...) (ADDRESS=...) (CONNECT_DATA= (SERVICE_NAME=xxxxxx)))
In Pfile below parameter entry :
Make sure whether we have created the password file on both primary and standby along with DBNAME. ex:
primary (PROD) =password would be orapwdPROD standby(PRODSTB)=password would be orapwdPROD