@simsa04 @lnxw48a1 I don't think it matters either, I use one myself.
Right now, it can confirm:
- There is no block at IP level, and no records of it.
- I've setup these two scripts to run every morning:
"php /var/www/gnusocial/plugins/OStatus/scripts/resub-feed.php https://gnusocial.net/url/8940902" and "php /var/www/gnusocial/plugins/OStatus/scripts/testfeed.php https://gnusocial.net/url/8940902".
I suggest you do the same, @lnxw48a1 at least until we find the error, as they seem to fix things.
- Nothing I can find in logs suggests a failure in federation; requests get responses with "accept" codes.
- For what is worth, we are using TLSv1.2 and TLSv1.3 only, but I see no issue with that in webserver logs.

I'll add more to this thread if/when I find it.