Paypal IPN not responding at all - php

Question

Anybody having this problem? Suddenly paypal is not returning POST data to the notify_url. Array is completely empty and it happens when payment is made through new paypal checkout system.
Below is the final page after payment is made. When I click continue booking, it should have redirected to notify_url with POST data for validation and stuff but data is an empty array.
My request code is listed below. Can anybody please take a look at it and tell me whether some variable is missing or i am doing something wrong?
<form method="post" name="paypal_form" action="http://www.sandbox.paypal.com/cgi-bin/webscr">
<input type="hidden" name="business" value="ayaz.a_1286483626_biz#gmail.com" />
<input type="hidden" name="cmd" value="_xclick" />
<!-- the next three need to be created -->
<input type="hidden" name="return" value="https://system1.smanager.net/SM/lib/booking_system/response.php" />
<input type="hidden" name="cancel_return" value="https://system1.smanager.net/SM/lib/booking_system/paypal_ipn.php?cancelled=true" />
<input type="hidden" name="notify_url" value="https://system1.smanager.net/SM/lib/booking_system/response.php" />
<input type="hidden" name="rm" value="2" />
<input type="hidden" name="currency_code" value="USD" />
<input type="hidden" name="lc" value="US" />
<input type="hidden" name="bn" value="toolkit-php" />
<input type="hidden" name="cbt" value="Continue Back to Booking System" />
<!-- Payment Page Information -->
<input type="hidden" name="no_shipping" value="" />
<input type="hidden" name="no_note" value="1" />
<input type="hidden" name="cn" value="Comments" />
<input type="hidden" name="cs" value="" />
<!-- Product Information -->
<input type="hidden" name="item_name" value="TestProduct" />
<input type="hidden" name="amount" value="10.23" />
<input type="hidden" name="quantity" value="1" />
<input type="hidden" name="item_number" value="1234" />
<input type="hidden" name="undefined_quantity" value="" />
<input type="hidden" name="on0" value="" />
<input type="hidden" name="os0" value="" />
<input type="hidden" name="on1" value="" />
<input type="hidden" name="os1" value="" />
<!-- Shipping and Misc Information -->
<input type="hidden" name="shipping" value="0.0" />
<input type="hidden" name="shipping2" value="" />
<input type="hidden" name="handling" value="" />
<input type="hidden" name="tax" value="6" />
<input type="hidden" name="custom" value="somedata" />
<input type="hidden" name="invoice" value="" />
<!-- Customer Information -->
<input type="hidden" name="first_name" value="ayaz" />
<input type="hidden" name="last_name" value="alavi" />
<input type="hidden" name="address1" value="Address" />
<input type="hidden" name="address2" value="" />
<input type="hidden" name="city" value="" />
<input type="hidden" name="state" value="abc" />
<input type="hidden" name="zip" value="" />
<input type="hidden" name="email" value="ayaz.a_1286483582_per#gmail.com" />
<input type="hidden" name="night_phone_a" value="" />
<input type="hidden" name="night_phone_b" value="" />
<input type="hidden" name="night_phone_c" value="" />
</form>
</body>
Thanks.

Answer 1

I have also face same problem.
Please set the following settings in Your business account.
In Website Payment Preferences
=> Auto Return: On
=> Set Return URL
=> Payment Data Transfer: On.
Please try this, this may help you.
All the best.
Kanji