Certificate Renewals Failing

SYSTEM INFORMATION
Ubuntu 20.04.6 REQUIRED
2.101 REQUIRED
7.7 Pro REQUIRED

Out of the blue, I have 3 sub-domains under jongriffith.com that are failing to renew certificates through Letsencrypt. I don’t know how to troubleshoot this.

I’ve got:

bitwarden.jongriffith.com, which expired on the 8/9 which won’t allow login without SSL
bookstack.jongriffith.com, which failed to renew on 8/11 and expires on the 20th.
ha.jongriffith.com, which expires in 1 day and failed on 8/11 to renew.

The other two subdomains have more than a month on them before renewal is attempted, I presume.

The error I’m getting on all of them is: “Web-based validation failed: saving debug log to /var/log/letsencrypt/letsencrypt.log”

The only thing that has changed on my system since the last successful renewal is that my annual subscription was paid and I don’t know if that does something to Virtualmin or not.

Either way, I’m getting:

"challenges": [
    {
      "type": "http-01",
      "status": "invalid",
      "error": {
        "type": "urn:ietf:params:acme:error:unauthorized",
        "detail": "68.15.186.195: Invalid response from http://bookstack.jongriffith.com/.well-known/acme-challenge/0dsYxKX_cx5oO9gfYzsf1D-QSyel5raS5fd9p38xhlU: 404",
        "status": 403
      },
      "url": "https://acme-v02.api.letsencrypt.org/acme/chall-v3/254083632606/mX-TLA",
      "token": "0dsYxKX_cx5oO9gfYzsf1D-QSyel5raS5fd9p38xhlU",
      "validationRecord": [
        {
          "url": "http://bookstack.jongriffith.com/.well-known/acme-challenge/0dsYxKX_cx5oO9gfYzsf1D-QSyel5raS5fd9p38xhlU",
          "hostname": "bookstack.jongriffith.com",
          "port": "80",
          "addressesResolved": [
            "68.15.186.195"
          ],
          "addressUsed": "68.15.186.195"
        }
      ],
      "validated": "2023-08-11T20:13:10Z"
    }
```

As I look deeper, the one thing they all have in common is that they're reverse proxied to other machines inside of my network.  Could this be the problem?  It wasn't a problem before.

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