Are you firewalled?
There were some download/upload problems if one candidate is firewalled. Also if both are firewalled it wont work.

What you can try to do:
- Quit Phex.
- Open the phex.cfg file with a text editor.
- Find the line
downloadCandidateLogBufferSize = 0
- Raise the value to maybe 500000 (means you use 500 KB more memory for download logging).
- When starting Phex you will find a 'Log' button on the candidate screen. Click on it to open a window with a communication log to this client (close and reopen it to view changes).

If you find anything strange, it might help to identify the problem. I think the ignore reason is not explicit mentioned yet, but next release would show it.
Here are possible reasons:
http://www.phex.kouk.de/mambo/content/view/61/33/

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