ORA-12560: TNS:protocol adapter error | connecting as SYS user

Experts -

I'm getting the following error when connecting using windows SQLPLUS command line.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options

  2  /

D
-
X

SQL> show user;
USER is "SYSTEM"
SQL> def
DEFINE _DATE           = "15-JUL-15" (CHAR)
DEFINE _CONNECT_IDENTIFIER = "ikbqas2" (CHAR)
DEFINE _USER           = "SYSTEM" (CHAR)
DEFINE _PRIVILEGE      = "" (CHAR)
DEFINE _SQLPLUS_RELEASE = "1002000100" (CHAR)
DEFINE _EDITOR         = "Notepad" (CHAR)
DEFINE _O_VERSION      = "Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Producti
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options" (CHAR)
DEFINE _O_RELEASE      = "1102000400" (CHAR)
SQL> conn sys / as sysdba
Enter password: *********
ERROR:
ORA-12560: TNS:protocol adapter error


Warning: You are no longer connected to ORACLE.

I can be able to connect as system but not as SYS.

Thanks,
Sve
LVL 18
sventhanAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

johnsoneSenior Oracle DBACommented:
The command should be

conn / as sysdba

or

conn sys as sysdba
slightwv (䄆 Netminder) Commented:
You don't show the connect string/process when you connected as system.
msb1979Commented:
adding to johnsone  comments

command should be

connect sys/<syspassword>@<your tnsnames> as sysdba
Determine the Perfect Price for Your IT Services

Do you wonder if your IT business is truly profitable or if you should raise your prices? Learn how to calculate your overhead burden with our free interactive tool and use it to determine the right price for your IT services. Download your free eBook now!

slightwv (䄆 Netminder) Commented:
The @tnsnames is not necessary if you are on the database server.
johnsoneSenior Oracle DBACommented:
Based on original post connect strings, my guess is the tnsname is not required in the connect string.

I also highly recommend against putting the password in the connect string like that.  Let SQL*Plus prompt for it.  Having a clear text password on your screen is a security risk.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
sventhanAuthor Commented:
Thanks for the help.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Oracle Database

From novice to tech pro — start learning today.