PayPal Community

  You have to update your scripts to HTTP 1.1   1.  modify the posted Header information from   $header .= "POST /cgi-bin/webscr HTTP/1.0\r\n"; into  $header .= "POST /cgi-bin/webscr HTTP/1.1\r\n";   2. add the Host variable to the header   that is typically missing in HTTP 1.0 requests!  so add a line like $header .= "Host: www.paypal.com\r\n"; if your script communicates with www.paypal.com  or   change it to the proper used endpoint host  like   ipnpb.paypal.com    good luck   ... View more

@ShorePatrol   and @kenirwin   I got the same problem and solved it by  modifying the posted Header information from   $header .= "POST /cgi-bin/webscr HTTP/1.0\r\n"; into  $header .= "POST /cgi-bin/webscr HTTP/1.1\r\n"; also be aware to add the Host variable to the header that is typically missing in HTTP 1.0 requests!!  so add a line like $header .= "Host: www.paypal.com\r\n"; if your script communicates with www.paypal.com  or  change it to the proper endpoint i.e.  ipnpb.paypal.com    good luck   ... View more