Connection reset

 We are getting an "IO Error: Connection reset" when we execute the following code:        DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
       con = DriverManager.getConnection(
                    "jdbc:oracle:thin:@" + dbaddr,
                    dbuser, dbpswd);

never gets to the next line:

log.WriteLog("Got connection.");

This does not happen all the time; it happens randomly as far as I can tell

Any ideas?