Metabox & Widgets list not refresing

Hi, I sent a direct email earlier in the week, but have some new information. Also I thought the discussion may be of use to others so I moved it to this forum.

Initial problem (production server):
When refreshing Metabox list red Application Error appeared after a while and list did not refresh.

We are running Commons in a Box (Buddypress-based plugin set) and I was initially concerned about conflicts.

I turned off all additional plugins except the Commons in a Box set without positive results.

wp-debug showed a few deprecated php notices.

I tried installing a similar environment as close as possible locally. Refresh worked just fine. Eliminated plugin conflicts as a cause.

I looked to developer tools on both production and local-test to compare processes. Production showed a timeout on the admin-ajax.php request.

We are running WordPress in docker containers behind a reverse proxy/lets encrypt ssl container pairing. I increased the proxy_read_timeout to 600.

This eliminated the Application Error message in the AAM interface, but the Metabox list is still not refreshing.

Differences between production/local environments.
1.) production is SSL port 443 local is non-SSL on port 80
2.) production has nginx rproxy/lets encrypt pairing in front of Apache served WordPress from docker containers. Local is straight apache served WordPress

Hopefully you have some advice to offer. I have a feeling that there may be some nginx reverse proxy settings that my be at fault, but I am a novice with such settings.

I’d be most appreciative if you are able to point me in the right direction.

Troy