Hello. Our member site has running great for a few years now, but in the last few days we have had numerous 'Looks like an invalid IPN post - no Invoice# passed' failures in the logs. Memberships ARE being paid for successfully via Epoch, but the message isn't returning to the site to mark the user as active. The full error is: Exception Am_Exception_Paysystem_TransactionEmpty Am_Paysystem_Transaction_Incoming->autoCreate [ library/Am/Paysystem/Transaction/Incoming.php : 302 ] Am_Paysystem_Transaction_Incoming->validate [ library/Am/Paysystem/Transaction/Abstract.php : 48 ] Am_Paysystem_Transaction_Abstract->process [ library/Am/Paysystem/Transaction/Incoming.php : 246 ] Am_Paysystem_Transaction_Incoming->process [ library/Am/Paysystem/Abstract.php : 463 ] Am_Paysystem_Abstract->directAction [ application/default/controllers/DirectController.php : 28 ] DirectController->__call [ library/Am/Controller.php : 118 ] Am_Controller->dispatch [ library/Zend/Controller/Dispatcher/Standard.php : 295 ] Zend_Controller_Dispatcher_Standard->dispatch [ library/Zend/Controller/Front.php : 954 ] Zend_Controller_Front->dispatch [ library/Am/App.php : 1950 ] Am_App->run [ index.php : 43 ] We are also getting : 'epoch post comes from unknown IP [68.71.103.50]' Full log: Exception Am_Exception_Paysystem_TransactionSource Am_Paysystem_Transaction_Incoming->_checkIp [ application/default/plugins/payment/epoch.php : 162 ] Am_Paysystem_Transaction_Epoch_IPN->validateSource [ library/Am/Paysystem/Transaction/Incoming.php : 300 ] Am_Paysystem_Transaction_Incoming->validate [ library/Am/Paysystem/Transaction/Abstract.php : 48 ] Am_Paysystem_Transaction_Abstract->process [ library/Am/Paysystem/Transaction/Incoming.php : 246 ] Am_Paysystem_Transaction_Incoming->process [ library/Am/Paysystem/Abstract.php : 463 ] Am_Paysystem_Abstract->directAction [ application/default/controllers/DirectController.php : 28 ] DirectController->__call [ library/Am/Controller.php : 118 ] Am_Controller->dispatch [ library/Zend/Controller/Dispatcher/Standard.php : 295 ] Zend_Controller_Dispatcher_Standard->dispatch [ library/Zend/Controller/Front.php : 954 ] Zend_Controller_Front->dispatch [ library/Am/App.php : 1950 ] Am_App->run [ index.php : 43 ] Does anybody know if this is a fault with Epoch (The IP address error seems like it could be the problem?) Or something else? IS there somewhere I can 'allow' that IP address so it all works? I hope someone can help soon - we're getting a lot of failed sales all of a sudden! Thank you!