ORA-12154: TNS:could not resolve the connect identifier specified

[oracle@hostname]$ sqlplus sys@teston as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Tue Jul 7 15:01:04 2015

Enter password:

ERROR:

When do you get this error?

Database is on in restricted on no mount status and you will see service handler for this instance is on BLOCKED or RESTRICTED state.

[oracle@hostname]$ lsnrctl status

LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 07-JUL-2015 15:20:35

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))

STATUS of the LISTENER

------------------------

Alias LISTENER

Version TNSLSNR for Linux: Version 11.2.0.3.0 - Production

Start Date 07-JUL-2015 14:18:31

Uptime 0 days 1 hr. 2 min. 3 sec

Trace Level off

Security ON: Local OS Authentication

SNMP OFF

Listener Parameter File /opt/oracle/product/11.2.0.3/network/admin/listener.ora

Listener Log File /opt/oracle/diag/tnslsnr/stagedevdb2/listener/alert/log.xml

Listening Endpoints Summary...

(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=stagedevdb2.ipx.com)(PORT=1521)))

Services Summary...

Service "+ASM" has 1 instance(s).

Instance "+ASM", status READY, has 1 handler(s) for this service...

Service "teston" has 1 instance(s).

Instance "teston", status BLOCKED, has 1 handler(s) for this service...

The command completed successfully

Solution:

Add (UR=A) in tnsnames.ora file.

TESTON =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = stagedevdb2.ipx.com)(PORT = 1521))

)

(CONNECT_DATA =

(SERVICE_NAME = teston)

(UR = A)

)

[oracle@hostname]$ sqlplus sys@teston as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Tue Jul 7 15:25:19 2015

Enter password:

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options