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Celoxis JDBC Probe is a java program that helps to understand connection issues with your database server. 

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Understanding the Error Messages

Common errors for Oracle

ERROR MESSAGEPOSSIBLE CAUSES
The Network Adapter could not establish the connection
  • The host name cannot be resolved by the DNS server.
  • Database server is not running on the host.
  • The database port on the database server is inaccessible because of a firewall 
Invalid username/password; logon deniedUsername or password is incorrect
Connection refused(DESCRIPTION=(TMP=) (VSNNUM=153092352)(ERR=12505) (ERROR_STACK=(ERROR=(CODE=12505)(EMFI=4))))
  • The database name is incorrect
  • The user doesn't have privileges to logon to the database

FAILURE: Listener refused the connection with the following error: ORA-12505, TNS:listener does not currently know of SID given in connect descriptor. [java.sql.SQLException]

One of the parameter you are passing is incorrect or the database does not exist using on the connection properties you are specifying.

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