APOP works from Mac/Eudora but not iPhone/nPOP

My server is running Qpopper version 4.0.9 (standalone).

Since Apple's iOS mail client doesn't support APOP, I purchased nPOP 
from the App Store. I entered the same settings as in Eudora, but I 
get errors.

I also noticed I couldn't change the password from within Eudora, 
which I used to be able to do; it gives a lost connection error.


How do I get things working properly?*
*connect from iOS (and change password from Mac)


thanks,
-Walter