Unable to complete acme verification

1. Caddy version (caddy version):

2.4.3

2. How I run Caddy:

as systems service

a. System environment:

Ubunutu 20

b. My complete Caddyfile or JSON config:

search.antarr.dev {
  encode zstd gzip
  reverse_proxy localhost:9200
  tls me@antarr.dev
}

3. The problem I’m having:

I’m unable to obtain a certificate.

4. Error messages and/or full log output:

Aug 16 23:28:44 dokku.antarr.dev caddy[83111]: {"level":"error","ts":1629174524.2559013,"logger":"tls.obtain","msg":"could not get certificate from issuer","identifier":"search.antarr.dev","issuer">
Aug 16 23:28:44 dokku.antarr.dev caddy[83111]: {"level":"error","ts":1629174524.25597,"logger":"tls.obtain","msg":"will retry","error":"[search.antarr.dev] Obtain: [search.antarr.dev] solving chall>
Aug 16 23:29:48 dokku.antarr.dev caddy[83111]: {"level":"info","ts":1629174588.024683,"logger":"tls.issuance.acme.acme_client","msg":"trying to solve challenge","identifier":"search.antarr.dev","ch>
Aug 16 23:29:51 dokku.antarr.dev caddy[83111]: {"level":"error","ts":1629174591.519029,"logger":"tls.issuance.acme.acme_client","msg":"challenge failed","identifier":"search.antarr.dev","challenge_>
Aug 16 23:29:51 dokku.antarr.dev caddy[83111]: {"level":"error","ts":1629174591.5191529,"logger":"tls.issuance.acme.acme_client","msg":"validating authorization","identifier":"search.antarr.dev","e>
Aug 16 23:29:52 dokku.antarr.dev caddy[83111]: {"level":"info","ts":1629174592.7868626,"logger":"tls.issuance.acme.acme_client","msg":"trying to solve challenge","identifier":"search.antarr.dev","c>
Aug 16 23:29:54 dokku.antarr.dev caddy[83111]: {"level":"error","ts":1629174594.690092,"logger":"tls.issuance.acme.acme_client","msg":"challenge failed","identifier":"search.antarr.dev","challenge_>
Aug 16 23:29:54 dokku.antarr.dev caddy[83111]: {"level":"error","ts":1629174594.6901968,"logger":"tls.issuance.acme.acme_client","msg":"validating authorization","identifier":"search.antarr.dev","e>
Aug 16 23:29:55 dokku.antarr.dev caddy[83111]: {"level":"error","ts":1629174595.8877153,"logger":"tls.obtain","msg":"could not get certificate from issuer","identifier":"search.antarr.dev","issuer">
Aug 16 23:29:56 dokku.antarr.dev caddy[83111]: {"level":"info","ts":1629174596.5313528,"logger":"tls.issuance.acme.acme_client","msg":"trying to solve challenge","identifier":"search.antarr.dev","c>

The log lines are truncated, so the important things are hidden… can you please use journalctl -u caddy --no-pager to obtain the full logs?

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