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PayPal Change?

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  • PayPal Change?

    I've been getting emails from PayPal that they are changing their IP addresses and that this could effect the two way communication between PayPal and my forums. They don't say that it will, but that only I should check and see if it will.

    Since I don't know how the VB 3.8 subscription routines are set up I thought I'd ask here. Any chance of this being a problem for VB 3.8 or 4.1 forums?

    Here's the email from PayPal:

    In a bulletin dated October 18, 2011, we announced that we were going to expand the number of IP addresses for to improve our site’s performance, scalability and availability. As part of this transition, we planned to discontinue support for HTTP 1.0 protocol starting October 7, 2013.
    We have recently identified that this change may impact the ability of some of our merchants to perform IPN (Instant Payment Notification) post-back validation or PDT (Payment Data Transfer) posts to and This happens when the IPN or PDT scripts use HTTP 1.0 protocol and do not include the “Host:” or “Host:” header in the HTTP request.
    Additional Details
    Starting October 7, 2013, we will require all incoming requests to have a “Host” header which complies with HTTP 1.1 Specifications. This header was not required under HTTP 1.0. IPN and PDT scripts using HTTP 1.0 may start failing with “HTTP/1.0 400 Bad Request” errors after October 7, 2013, which will result in IPN messages not being validated successfully, or PDT scripts not being able to retrieve transaction information.
    Action Required before October 7, 2013
    Merchants need to update their IPN and/or PDT scripts to use HTTP 1.1, and include the “Host” and “Connection: close” HTTP header in the IPN postback script.
    Example with Host as (please make necessary changes if you are using
    //Set values for the request back
    $req=HTTP::Request->new('POST', '');
    $req->header(Host=> '');
    $req->header(Connection=> 'close');
    // post back to PayPal system to validate
    $header="POST /cgi-bin/webscr HTTP/1.1\r\n";
    $header .="Content-Type: application/x-www-form-urlencoded\r\n";
    $header .="Host:\r\n";
    $header .="Connection: close\r\n\r\n";
    HttpsURLConnection uc=(HttpsURLConnection) u.openConnection();
    uc.setRequestProperty("Host", "");
    uc.setRequestProperty("Connection", "Close");
    The PayPal Sandbox has been configured to reject any HTTP requests without the “Host” header with HTTP 400 error. Merchants can use the Sandbox environment to certify the changes to their IPN and PDT scripts.
    For more information on PDT and IPN, please refer to and For additional information or questions about this change, please contact PayPal's Merchant Technical Support team via

  • #2
    As long as your have cURL support, you should be fine.


    widgetinstance 262 (Related Topics) skipped due to lack of content & hide_module_if_empty option.