##################################################
##   How to establish remote connection to a    ##  
##   database in restricted or NO MOUNT mode    ##
##################################################

Connections via listener to an instance that is in RESTRICTED status or 
in NO MOUNT status fail with TNS-12526, TNS-12527 or TNS-12528 even 
when supplying the credentials for a privileged account.
   
The lsnrctl services output will show that the service handler for this 
instance is in state: BLOCKED or RESTRICTED.

 
DBTEST_PRIV = 
   (DESCRIPTION = 
     (ADDRESS_LIST = 
          (ADDRESS = (PROTOCOL = TCP)(HOST = rm01it.emilianofusaglia.net)(PORT = 1522)))
      (CONNECT_DATA = 
          (UR=A) 
          (SERVICE_NAME = dbtest.emilianofusaglia.net) 
       ) 
     ) 
 

 
Note that the (UR=A) clause is intended to work with a dynamically 
registered handler so the use of SERVICE_NAME versus SID is preferred.  
SID may connect to a statically configured handler.