title: ORA-12528, TNS:listener: all appropriate instances are blocking new connections
body: <p>Hi when trying to create Repository Creation Utility by Data Connection details are not excepting.it throws the Exception is</p>
  
  <pre><code>Listener refused the connection with the following error:
  ORA-12528, TNS:listener: all appropriate instances are blocking new connections
  </code></pre>
  
  <p>tnsnames.ora</p>
  
  <pre><code>XE =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = sivanagendra-lap)(PORT = 1521))
      (CONNECT_DATA =
        (SERVER = DEDICATED)
        (SERVICE_NAME = XE)
      (UR = A)
      )
    )
  
  EXTPROC_CONNECTION_DATA =
    (DESCRIPTION =
      (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
      )
      (CONNECT_DATA =
        (SID = PLSExtProc)
        (PRESENTATION = RO)
      )
    )
  
  ORACLR_CONNECTION_DATA = 
    (DESCRIPTION = 
      (ADDRESS_LIST = 
        (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1)) 
      ) 
      (CONNECT_DATA = 
        (SID = CLRExtProc) 
        (PRESENTATION = RO) 
      ) 
    ) 
  </code></pre>
  
  <p>Please give me solutions on this issue.</p>