Remote debugging with Quanta+ on Linux

Hello all,

I am trying to remotely debug a PHP application.

I have the following setup:
- Web server A (application accessed via https, PHP with XDebug
extension installed)
- Development server B (location of the php scripts)
- Remote workstation C (with Quanta+)

After a lot of searching for infos and trial and error I have not been
able to configure my environment on workstation C so I can remotely
debug PHP scripts executed on server B.

Does anybody use a similar configuration and know how to configure
Quanta+?
What other options for remote debugging do I have?

Thanks in advance for any hint,
Roger