500 Unable To Connect

[troy]

Hi All,
I am trying to submit to JK but after 3 weeks I only get:

Error!
Your submission could not be accepted for the following reason(s):
Your Site's URL appears invalid, as it has returned the response "500 Unable To Connect".

I tried to email JK but got no reply. Anyone here knows what might be the problem?
It can't be on my side because everything is up and running. I also submitted different URL's.

Thanks in advance.