@ Terry – are you using the XML-RPC Bonus Custom Code in this forum topic? If so, you can either add the additional IP addresses that need to be whitelisted or you can remove the code from BPS Custom Code.
BPS and BPS Pro have built-in troubleshooting steps. Everything can be turned On or Off individually for troubleshooting. See the BPS Pro troubleshooting steps here: BPS Pro Troubleshooting Steps