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Paypal error: Unable to start Express Checkout.

JohanD Total Posts: 5 Joined: 2010-03-23 Ignore user	Hi, I have a Magento 1.4.0.1 install and using Paypal Website Payments Pro. This worked fine for a couple of months. Now when a user wants to pay with paypal, there is an error shown: Unable to start Express Checkout. I did not update or did not core changes. Paypal says the error is in the Magento install. The error log says this; exception 'Exception' with message 'Notice: Undefined index: ACK in /var/www/vhosts/mywebsite.com/httpdocs/app/code/core/Mage/Paypal/Model/Api/Nvp.php on line 600' in /var/www/vhosts/mywebsite.com/httpdocs/app/code/core/Mage/Core/functions.php:245 Stack trace: #0 /var/www/vhosts/mywebsite.com/httpdocs/app/code/core/Mage/Paypal/Model/Api/Nvp.php(600): mageCoreErrorHandler(8, 'Undefined index...', '/var/www/vhosts...', 600, Array) #1 /var/www/vhosts/mywebsite.com/httpdocs/app/code/core/Mage/Paypal/Model/Api/Nvp.php(558): Mage_Paypal_Model_Api_Nvp->_isCallSuccessful(Array) #2 /var/www/vhosts/mywebsite.com/httpdocs/app/code/core/Mage/Paypal/Model/Api/Nvp.php(368): Mage_Paypal_Model_Api_Nvp->call('SetExpressCheck...', Array) #3 /var/www/vhosts/mywebsite.com/httpdocs/app/code/core/Mage/Paypal/Model/Express/Checkout.php(211): Mage_Paypal_Model_Api_Nvp->callSetExpressCheckout() #4 /var/www/vhosts/mywebsite.com/httpdocs/app/code/core/Mage/Paypal/Controller/Express/Abstract.php(61): Mage_Paypal_Model_Express_Checkout->start('https://www.bik...', 'https://www.bik...') #5 /var/www/vhosts/mywebsite.com/httpdocs/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Paypal_Controller_Express_Abstract->startAction() #6 /var/www/vhosts/mywebsite.com/httpdocs/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('start') #7 /var/www/vhosts/mywebsite.com/httpdocs/app/code/core/Mage/Core/Controller/Varien/Front.php(177): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http)) #8 /var/www/vhosts/mywebsite.com/httpdocs/app/code/core/Mage/Core/Model/App.php(304): Mage_Core_Controller_Varien_Front->dispatch() #9 /var/www/vhosts/mywebsite.com/httpdocs/app/Mage.php(596): Mage_Core_Model_App->run(Array) #10 /var/www/vhosts/mywebsite.com/httpdocs/index.php(78): Mage::run('', 'store') So I think I get no ACK back from paypal. How can I solve this?
	Posted: April 18 2011 \| top

JohanD Total Posts: 5 Joined: 2010-03-23 Ignore user	I found the solution. Outgoing https traffic was blocked by the firewall on the server. Outgoing https was added to the firewall rules and Paypal works again.
	Posted: April 20 2011 \| top \| # 1

qinwubi Total Posts: 6 Joined: 2011-11-01 Ignore user	JohanD - 20 April 2011 03:18 AM I found the solution. Outgoing https traffic was blocked by the firewall on the server. Outgoing https was added to the firewall rules and Paypal works again. same issue. will give it a try.
	Posted: October 5 2012 \| top \| # 2

qinwubi Total Posts: 6 Joined: 2011-11-01 Ignore user	actually my problem is the zero subtotal. paypal express checkout does not allow zero subtotal. but in magento the subtotal is set zero. ironically paypal express checkout is the only supported payment method. kidding?! yeah that’s right.
	Posted: October 5 2012 \| top \| # 3

antihero118 Total Posts: 4 Joined: 2012-09-03 Ignore user	Hi, I’m having the very same issue here. Port 443, which is the default port for HTTPS, is open for both incoming, and outgoing traffic. I’m going to try disabling the firewall temporarily to see if it’s a firewall issue, however I’ve been scouring the forums and none of the ‘solutions’ I’ve found have worked for me. PayPal support says it’s an issue with magento… I’m getting nowhere fast. Any thoughts?
	Posted: December 31 2012 \| top \| # 4

ccobbel Total Posts: 6 Joined: 2011-03-09 Ignore user	hello, Since the hosting compagnie has upgrated CentOS to CentOS 5.9 version, paypal pro and paypoal express don’t work anymore. Magento 1.6 Here the message : ERR (3): Notice: Undefined index: ACK in /home/xxxxxx/domains/xxxxxxx/public_html/app/code/core/Mage/Paypal/Model/Api/Nvp.php on line 1038 Anybody has found a solution ? Thanks
	Posted: March 11 2013 \| top \| # 5

antihero118 Total Posts: 4 Joined: 2012-09-03 Ignore user	The issue I had with PayPal actually stemmed from an issue with a gift certificate extension my client purchased from Unirgy. The extension has a serial number and the serial number was coming back as invalid. This prevented PayPal from functioning on my site. If you have any Unirgy extension, and are experiencing issues with PayPal not working, contact customer service and they will fix it for you.
	Posted: March 11 2013 \| top \| # 6

ccobbel Total Posts: 6 Joined: 2011-03-09 Ignore user	Thanks Antihero But no we don’t have any extension. Paypal has been working well for 2 years and suddently it has stopped working after a CentOS update. We didn’t change anythink on Magento, only CentOS was upgrated.
	Posted: March 11 2013 \| top \| # 7

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