Latest Technical update Email from Authorize Net About IP Address Change
If you are using Authorize Net as your payment gateway, you should recently get an email from them about this :
Or you can also read from their announcement page below:
For those VPCart hosting customers and our Business Ready Plan customers that use Authorize Net to take payment, we would like to confirm our servers firewall does not only limit to a particular IP addresses to access site.
Our port 80 and port 443 are opened to all IPs.
You can ignore their latest email about this.
If you have any questions regarding this, you can submit a helpdesk ticket to us.