Enterprise Manager is not able to connect to the database instance

I install the Oracle 10 after that I create database called Test_Db and the SID is TestDb

But when I run the Enterprise Manager I get Database Instance is down and Listener

See the picture
Who is Participating?

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

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.

DavidSenior Oracle Database AdministratorCommented:
The 12541 simply says you don't have a valid connection.  From the looks of things I'd start with the listener process.  Your listener log and your alert log I presume you've already checked?
interbusAuthor Commented:
Where is the listener / alert log ?

DavidSenior Oracle Database AdministratorCommented:
alert.log is traditionally found in the BDUMP directory under ORACLE_HOME, for example /ora01/app/oracle/product/10.2.0/db_1/admin/bdump.  Your actual results may differ. :)
The listener.log is likewise under the ORACLE_HOME, as in .../network/admin .
DavidSenior Oracle Database AdministratorCommented:
May I be of any further service?  Otherwise please rate your satisfaction with my answer and award points.

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
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.