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Troubleshooting: Unable to Connect to DB Control (dbconsole) from the Browser (Doc ID 404820.1)

Last updated on AUGUST 19, 2022

Applies to:

Enterprise Manager for Oracle Database - Version to [Release 10.2 to 11.2]
Information in this document applies to any platform.


To help resolve connection problems to dbconsole via a browser.

The purpose of this Note is to fast-track the debugging process with regard to the inability to connect or login to DB Console via a web-browser.  Typically, when experiencing connection problems with dbconsole the following type of errors will be returned after entering the dbconsole URL into the browser.

"This web page is not available"


"Unable to connect"


"Internet Explorer cannot display the webpage"



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In this Document
 To help resolve connection problems to dbconsole via a browser.
 1.  Check whether it's possible to access dbconsole from a different browser.
 2. Confirm that dbconsole is running.
 3. Is it possible to connect from a browser on the dbconsole machine itself?
 5. Ensure that the Database is up & running
 6. Check the Listener
 8. Check to see whether the SYSMAN or DBSNMP user passwords have recently changed.
 9. Ensure that the OEM_MONITOR privilege exists
 10. Other Connection Related Problems with DB Console
 [Problem:] ORA-1017 ERROR when logging into DB Console.
 [Problem:] Agent sends message "Failed to connect to database instance: ORA-12537: TNS:connection closed (DBD ERROR: OCIServerAttach)." though everything seems to be fine.
 [Problem:] when connecting to DB Console as SYSDBA in a Windows Environment. It returns insuffient privleges ORA-01031.
 [Problem:]  The Browser shows an empty page or empty page with 5 strange line/box characters at the top.

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