[@gbbgadmin Participant 9 years, 11 months ago]

Update. Today we did the following:

1. Deactivated all BuddyPress and bbPress plugins. Uninstalled all BuddyPress and bbPress plugins. Removed all BuddyPress and bbPress data from the database, but kept a backup copy of the data and tables.
2. Installed fresh WordPress on fresh server. Installed new, fresh plugins.
3. Site worked.
4. Replaced data from backup.
5. Entire site works, EXCEPT there is a 503 error when people try to post a reply on a forum, and a 503 error when we try to go to the “replies” page from the wp-admin.

So, maybe something in the data? Could someone have posted a reply that has some content that is breaking the php code when trying to see the Admin panel “replies” page or when people try to post a reply?

We have learned another thing. When people post a reply, the reply DOES go into the db and it is visible to other members on the forum. HOWEVER, the person posting the reply gets a 503 error during the process and has to come back to the site fresh to see the forum, including their post.

Something is causing a 503 error ONLY when replying OR when we try to access the Admin “Replies” page as admin. It is very very strange.