I have some problem about wifi sync with iOS5

Question

Hi~everbody~
I have some problem with wifi sync, and still don't know how to resolve it. Please Help Me~
First,I using Windows 7 64-bit, the latest iTunes 10.5, and iPod touch 4 with 5.0(9A334), and of course a WIFI AP in my room.
Here is my major problem:
When I setted up enable wifi sync in iTunes summary, the iTunes had identified my iPod and show at left side in iTunes,
even when I unplug  my iPod touch 4 from my computer, the iTunes still shows there.
But after one day when I came home, I opened the iTunes want do a wireless sync, but the iTunes did not found my machine.
I have tried restart computer, restart WIFI AP, disable anti-virus software, close MSN, close teamviewer, and any software may caused some unstable network issue between iTunes and iPod touch 4, but when I done these whole things, the iTunes still not found my iPod.
So I want to know do Wifi Sync needs any specific net port ? like 80 port or some port else?
Wish there are somebody can help me fix this, very appreciate.
BTW: Even iTunes did not found my iPod touch 4, but I can still using "Remote App" to control iTunes music play, so I really confuse why it just can't do wifi sync ?

Answer 1

This error has got nothing to do with rmi.
The StackOverflowError means the Java VM stack is filled up. The
stack is used for keeping track of method calls. An easy way to
produce a StackOverFlowErrer is the following code:
class Test {
public static void main(String[] args) {
a();
static void a() {
a();
So if you call method a() within the same method, the stack
fills up quickly.