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

Download

Click here to download the jdbc-probe.zip file. 

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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

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