I'm so sorry for missing your email.
Like Olivier, my initial hypothesis is a broken firewall or a network
configuration issue. If you have python installed on the server, you
can try one the libraries mentioned in the this StackOverflow thread
[1]. Hopefully this exercise will localize the issue more and
determine if the issue is a library/JVM issue or a networking issue.
Please keep us posted and update us with your solution.
Regards,
Mahmood
[1] http://stackoverflow.com/questions/1172769/connecting-to-apns-for-iphone-using-python