While trying to get a connection in JDBC I am getting the error: java.sql.SQLException: Protocol violation.

I don't have any problem with JDBC connection with another Oracle instance on the same machine.

I am using using Servlets in iPlanet web server. The code was working earlier but somehow it is not working now. I suspect it may be something to do with the Oracle db.

Anyone knows why I am getting the Protocol violation error and how it can be resolved?