XMLRPC issues with Zapier and IFTTT

thanks @wfdave for the prompt reply!
I have located the file, and searched for “xmlrpc” and didn’t find any mention.
I believe that rules out a block coming from .htaccess.

Any other angles to check?
Would Jetpack interfere with the list of IP addresses that can use xlmrpc?

Will do @wfdave. Thanks for the guidance. A few questions for me to prepare next steps:

How do I perform a test to see if a particular service (or IP) can use XMLRPC? I.e., how do I “simulate” XMLRPC behavior for request from a particular service?
This would speed up the test and minimize the time in which I have Wordfence off, thus decreasing vulnerabilities on my website.

Also: What types of plugins are likely to mess with XMLRPC?
This is to help me prioritize the individual tests.

Also, to articulate the following: Jetpack for instance is washing their hands and asking me to contact hosting provider to change XMLRPC settings… which might lead to a fix, but almost certainly is not fixing the root cause of the problem.

Thanks for sharing this, Dave. When there are multiple hands on deck, it really helps to understand the role of each player and who’s more likely to be the root cause of the issue.

I just wrote to my hosting company describing the issue and adding all the diags evidence. Will keep you posted.