Re-Enabling Pingbacks?

There are other update services you could use listed at https://www.ads-software.com/documentation/article/update-services/.

If the CMS systems involved are configured to send and receive pingbacks, an update service isn’t necessary AFAIK. The two systems can directly interact with each other. Do you still have the attempt to notify and allow link notifications discussion settings checked? Try disabling them, then re-enabling.

IIRC, self-pings (internal links) are disabled. Only references to posts at other sites generate pingbacks.

If you continue to have trouble, let’s see if WP is really receiving pingbacks. Someone would need to link to one of your posts from a CMS that supports pingbacks. If they do, the pingback request should appear in your server access logs.

Thanks for that.

My immediate interest is in internal self-pings – later posts referring to an older post, resulting in a forward link in the comments of the older post.

Worked successfully for many years.
(Here an example old post with several later links via pingback)
https://www.psybertron.org/archives/11810

I checked the notify attempt / allow boxes were checked (they were). Then unchecked, saved and re-checked, saved – so far no sign of new pingbacks (yet).

I will check with external sites too, but that behaviour too seemed to work previously, but doesn’t recently – same as internal pings.

Also wondered if something new in JetPack or Akismet was blocking? Browsed around all settings, couldn’t see anything relevant.

Here, the test post I made after unchecking / rechecking (no pingback so far) https://www.psybertron.org/archives/16907

• This reply was modified 1 year, 9 months ago by psybertron.
• This reply was modified 1 year, 9 months ago by psybertron.
• This reply was modified 1 year, 9 months ago by psybertron.

My memory must be faulty, this article reinforces your assertion that self pings should work. Are you sure your posts have pingbacks enabled? There’s a section about disabling pings in the above linked article. I checked that setting on my posts and they’re not checked by default. It may be because until recently I had pingbacks disabled in discussion settings.

Pingbacks work via RPC. RPC is often disabled by some because of a perceived security risk. It’s not much of a risk, but if RPC is not used it makes sense to disable it anyway. I don’t think JetPack or Akismet would do so, but some security oriented plugins will disable RPC. I’d expect it to be an optional security measure.

I can see that posts have the proper pingback link and header telling other sites where to send pingback requests (xmlrpc.php) but I haven’t seen WP actually send out such a request. I even tried explicitly calling pingback() and found no evidence that a RPC request took place. It’s going to take more time to dig further to learn why no RPC request is sent. I’m willing to do some more digging, but it wouldn’t be for a while.

Thanks for that. I had seen that article, and another subscriber pointed out that the pingback needs to have the explicit https:// or https:// form to work, not the implicit or relative form … anyway, I have some things to test out now. Thanks again.

Still not resolved and none the wiser why, if you or anyone has any more specific ideas?