The processing server was unable to POST to the return address (ret_addr).

  • Dear Support Team,

    We are using the iTransact payment gateway plugin for our wordpress site. We are not making any changes to the plugin from our end. After the transaction, the customer is simply redirected to a Thank you page.

    After completing the transaction, the customer gets an error email that there has been a critical error on the website. But there is no error in debug log.
    Kindly suggest how we troubleshoot this issue and fix it.

    Message the customer gets at iTransact site after payment:
    YOUR TRANSACTION HAS BEEN PROCESSED.
    HOWEVER, WE’VE ENCOUNTERED A PROBLEM:

    Your transaction was successful, but we were unable to post this result back to the merchant’s web site.
    You can press the submit button below to attempt to contact the web site. (This will NOT resubmit your transaction or bill your account again.) If this is not successful, please contact the merchant directly.

    The processing server was unable to POST to the return address (ret_addr). We received a bad response.

    HTTP/1.1 500 Internal Server Error

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