Debug PLSQL code from JDeveloper 10.1.3.x causing timed out error

You may find that when trying to debug PLSQL from JDeveloper an error as follows appears:

Connecting to the database MyHRConn.
Executing PL/SQL: ALTER SESSION SET PLSQL_DEBUG=TRUE
Executing PL/SQL: CALL DBMS_DEBUG_JDWP.CONNECT_TCP( '172.16.26.237', '4717' )
ORA-30683: failure establishing connection to debugger
ORA-12535: TNS:operation timed out
ORA-06512: at "SYS.DBMS_DEBUG_JDWP", line 68
ORA-06512: at line 1
Process exited.
Disconnecting from the database MyHRConn.

It's very likely from the error you have a firewall between the client (JDeveloper) and the database server in which case you can simply open up the port at the firewall level, but while it's dynamically assigned this won't work, so follow these steps to ensure you use a static port and then you can configure the firewall to enable the connection

1. If necessary, close JDeveloper.
2. In a text editor, open {jdev_install}/jdev/system/oracle.jdeveloper./ide.properties
3. Type the following:

DatabaseDebuggerPortOverride={port_number}

where is the {port_number} is the port number you want the debugger to use.

4. Save ide.properties.

When you restart JDeveloper, the port you specified will be used and hopefully you can connect without any issue.