I'm having the exact same issue, did you manage to solve it? can anyone help with this ?

Do I need to launch the wallet as a server? or just launch it as is? I also turned gen=0 (but even with gen=1) I coudn't mine on two different machines since I can't find nodes.

I also had this issue in the past with cudaminer but aftersearching for a couple of hours I gave up (since I only have an Nvidia card on my laptop)
When I used xptproxy to try ypool, it was mining, although it showed no shares of course (boo! and on xptproxy cmd it says algho unknown)

Thank you in advance for your help