Check out the logs of my container caddy. Or Pastbin.
{"level":"info","ts":1614185807.673957,"msg":"shutting down apps then terminating","signal":"SIGTERM"}
{"level":"info","ts":1614185808.6750298,"logger":"tls.cache.maintenance","msg":"stopped background certificate maintenance","cache":"0xc00042afc0"}
{"level":"info","ts":1614185808.6752598,"logger":"tls.obtain","msg":"releasing lock","identifier":"lowarya.net"}
{"level":"info","ts":1614185808.6752853,"logger":"tls.obtain","msg":"releasing lock","identifier":"www.lowarya.net"}
{"level":"error","ts":1614185808.6757424,"logger":"tls","msg":"job failed","error":"lowarya.net: obtaining certificate: context canceled"}
{"level":"error","ts":1614185808.6757555,"logger":"tls","msg":"job failed","error":"www.lowarya.net: obtaining certificate: context canceled"}
{"level":"info","ts":1614185809.1758463,"logger":"admin","msg":"stopped previous server"}
{"level":"info","ts":1614185809.1760871,"msg":"shutdown done","signal":"SIGTERM"}
{"level":"info","ts":1614282351.1134455,"msg":"using provided configuration","config_file":"/etc/caddy/Caddyfile","config_adapter":"caddyfile"}
{"level":"info","ts":1614282351.120586,"logger":"admin","msg":"admin endpoint started","address":"tcp/localhost:2019","enforce_origin":false,"origins":["localhost:2019","[::1]:2019","127.0.0.1:2019"]}
{"level":"info","ts":1614282351.1215386,"logger":"tls.cache.maintenance","msg":"started background certificate maintenance","cache":"0xc0003e5490"}
{"level":"info","ts":1614282351.1220176,"logger":"http","msg":"server is listening only on the HTTPS port but has no TLS connection policies; adding one to enable TLS","server_name":"srv0","https_port":443}
{"level":"info","ts":1614282351.122057,"logger":"http","msg":"enabling automatic HTTP->HTTPS redirects","server_name":"srv0"}
{"level":"info","ts":1614282351.122928,"logger":"http","msg":"enabling automatic TLS certificate management","domains":["www.lowarya.net","lowarya.net"]}
{"level":"info","ts":1614282351.123872,"msg":"autosaved config","file":"/config/caddy/autosave.json"}
{"level":"info","ts":1614282351.124019,"msg":"serving initial configuration"}
{"level":"info","ts":1614282351.1247184,"logger":"tls.obtain","msg":"acquiring lock","identifier":"www.lowarya.net"}
{"level":"info","ts":1614282351.1262805,"logger":"tls.obtain","msg":"lock acquired","identifier":"www.lowarya.net"}
{"level":"info","ts":1614282351.1250682,"logger":"tls.obtain","msg":"acquiring lock","identifier":"lowarya.net"}
{"level":"info","ts":1614282351.126771,"logger":"tls.obtain","msg":"lock acquired","identifier":"lowarya.net"}
{"level":"info","ts":1614282351.1271727,"logger":"tls","msg":"cleaned up storage units"}
{"level":"info","ts":1614282351.154174,"logger":"tls.issuance.acme","msg":"waiting on internal rate limiter","identifiers":["www.lowarya.net"]}
{"level":"info","ts":1614282351.1542013,"logger":"tls.issuance.acme","msg":"waiting on internal rate limiter","identifiers":["lowarya.net"]}
{"level":"info","ts":1614282351.1544158,"logger":"tls.issuance.acme","msg":"done waiting on internal rate limiter","identifiers":["www.lowarya.net"]}
{"level":"info","ts":1614282351.154606,"logger":"tls.issuance.acme","msg":"done waiting on internal rate limiter","identifiers":["lowarya.net"]}
{"level":"info","ts":1614282352.3780818,"logger":"tls.issuance.acme.acme_client","msg":"trying to solve challenge","identifier":"www.lowarya.net","challenge_type":"dns-01","ca":"https://acme-v02.api.letsencrypt.org/directory"}
{"level":"info","ts":1614282352.7044818,"logger":"tls.issuance.acme.acme_client","msg":"trying to solve challenge","identifier":"lowarya.net","challenge_type":"dns-01","ca":"https://acme-v02.api.letsencrypt.org/directory"}
{"level":"error","ts":1614282353.5047364,"logger":"tls.issuance.acme.acme_client","msg":"cleaning up solver","identifier":"www.lowarya.net","challenge_type":"dns-01","error":"no memory of presenting a DNS record for www.lowarya.net (probably OK if presenting failed)"}
{"level":"error","ts":1614282353.6525683,"logger":"tls.obtain","msg":"will retry","error":"[www.lowarya.net] Obtain: [www.lowarya.net] solving challenges: presenting for challenge: adding temporary record for zone lowarya.net.: got error status: HTTP 400: [{Code:6003 Message:Invalid request headers}] (order=https://acme-v02.api.letsencrypt.org/acme/order/113609671/8121643786) (ca=https://acme-v02.api.letsencrypt.org/directory)","attempt":1,"retrying_in":60,"elapsed":2.526122497,"max_duration":2592000}
{"level":"error","ts":1614282354.299245,"logger":"tls.issuance.acme.acme_client","msg":"cleaning up solver","identifier":"lowarya.net","challenge_type":"dns-01","error":"no memory of presenting a DNS record for lowarya.net (probably OK if presenting failed)"}
{"level":"error","ts":1614282354.4408627,"logger":"tls.obtain","msg":"will retry","error":"[lowarya.net] Obtain: [lowarya.net] solving challenges: presenting for challenge: adding temporary record for zone lowarya.net.: got error status: HTTP 400: [{Code:6003 Message:Invalid request headers}] (order=https://acme-v02.api.letsencrypt.org/acme/order/113609671/8121643849) (ca=https://acme-v02.api.letsencrypt.org/directory)","attempt":1,"retrying_in":60,"elapsed":3.314070923,"max_duration":2592000}
{"level":"info","ts":1614282414.6645567,"logger":"tls.issuance.acme.acme_client","msg":"trying to solve challenge","identifier":"www.lowarya.net","challenge_type":"dns-01","ca":"https://acme-staging-v02.api.letsencrypt.org/directory"}
{"level":"error","ts":1614282415.4613917,"logger":"tls.issuance.acme.acme_client","msg":"cleaning up solver","identifier":"www.lowarya.net","challenge_type":"dns-01","error":"no memory of presenting a DNS record for www.lowarya.net (probably OK if presenting failed)"}
{"level":"info","ts":1614282415.7531357,"logger":"tls.issuance.acme.acme_client","msg":"trying to solve challenge","identifier":"lowarya.net","challenge_type":"dns-01","ca":"https://acme-staging-v02.api.letsencrypt.org/directory"}
{"level":"error","ts":1614282416.0117018,"logger":"tls.obtain","msg":"will retry","error":"[www.lowarya.net] Obtain: [www.lowarya.net] solving challenges: presenting for challenge: adding temporary record for zone lowarya.net.: got error status: HTTP 400: [{Code:6003 Message:Invalid request headers}] (order=https://acme-staging-v02.api.letsencrypt.org/acme/order/18231387/247243714) (ca=https://acme-staging-v02.api.letsencrypt.org/directory)","attempt":2,"retrying_in":120,"elapsed":64.885255503,"max_duration":2592000}
{"level":"error","ts":1614282416.5793214,"logger":"tls.issuance.acme.acme_client","msg":"cleaning up solver","identifier":"lowarya.net","challenge_type":"dns-01","error":"no memory of presenting a DNS record for lowarya.net (probably OK if presenting failed)"}
{"level":"error","ts":1614282416.7273855,"logger":"tls.obtain","msg":"will retry","error":"[lowarya.net] Obtain: [lowarya.net] solving challenges: presenting for challenge: adding temporary record for zone lowarya.net.: got error status: HTTP 400: [{Code:6003 Message:Invalid request headers}] (order=https://acme-staging-v02.api.letsencrypt.org/acme/order/18231387/247243727) (ca=https://acme-staging-v02.api.letsencrypt.org/directory)","attempt":2,"retrying_in":120,"elapsed":65.600592996,"max_duration":2592000}
{"level":"info","ts":1614282537.4083526,"logger":"tls.issuance.acme.acme_client","msg":"trying to solve challenge","identifier":"www.lowarya.net","challenge_type":"dns-01","ca":"https://acme-staging-v02.api.letsencrypt.org/directory"}
{"level":"info","ts":1614282537.8909068,"logger":"tls.issuance.acme.acme_client","msg":"trying to solve challenge","identifier":"lowarya.net","challenge_type":"dns-01","ca":"https://acme-staging-v02.api.letsencrypt.org/directory"}
{"level":"error","ts":1614282538.1968732,"logger":"tls.issuance.acme.acme_client","msg":"cleaning up solver","identifier":"www.lowarya.net","challenge_type":"dns-01","error":"no memory of presenting a DNS record for www.lowarya.net (probably OK if presenting failed)"}
{"level":"error","ts":1614282538.3424087,"logger":"tls.obtain","msg":"will retry","error":"[www.lowarya.net] Obtain: [www.lowarya.net] solving challenges: presenting for challenge: adding temporary record for zone lowarya.net.: got error status: HTTP 400: [{Code:6003 Message:Invalid request headers}] (order=https://acme-staging-v02.api.letsencrypt.org/acme/order/18231387/247244545) (ca=https://acme-staging-v02.api.letsencrypt.org/directory)","attempt":3,"retrying_in":120,"elapsed":187.215962597,"max_duration":2592000}
{"level":"error","ts":1614282538.9540389,"logger":"tls.issuance.acme.acme_client","msg":"cleaning up solver","identifier":"lowarya.net","challenge_type":"dns-01","error":"no memory of presenting a DNS record for lowarya.net (probably OK if presenting failed)"}
{"level":"error","ts":1614282539.0988069,"logger":"tls.obtain","msg":"will retry","error":"[lowarya.net] Obtain: [lowarya.net] solving challenges: presenting for challenge: adding temporary record for zone lowarya.net.: got error status: HTTP 400: [{Code:6003 Message:Invalid request headers}] (order=https://acme-staging-v02.api.letsencrypt.org/acme/order/18231387/247244550) (ca=https://acme-staging-v02.api.letsencrypt.org/directory)","attempt":3,"retrying_in":120,"elapsed":187.972014776,"max_duration":2592000}
{"level":"info","ts":1614282659.2607992,"logger":"tls.issuance.acme.acme_client","msg":"trying to solve challenge","identifier":"www.lowarya.net","challenge_type":"dns-01","ca":"https://acme-staging-v02.api.letsencrypt.org/directory"}
{"level":"info","ts":1614282659.9691448,"logger":"tls.issuance.acme.acme_client","msg":"trying to solve challenge","identifier":"lowarya.net","challenge_type":"dns-01","ca":"https://acme-staging-v02.api.letsencrypt.org/directory"}
{"level":"error","ts":1614282660.0919404,"logger":"tls.issuance.acme.acme_client","msg":"cleaning up solver","identifier":"www.lowarya.net","challenge_type":"dns-01","error":"no memory of presenting a DNS record for www.lowarya.net (probably OK if presenting failed)"}
{"level":"error","ts":1614282660.311493,"logger":"tls.obtain","msg":"will retry","error":"[www.lowarya.net] Obtain: [www.lowarya.net] solving challenges: presenting for challenge: adding temporary record for zone lowarya.net.: got error status: HTTP 400: [{Code:6003 Message:Invalid request headers}] (order=https://acme-staging-v02.api.letsencrypt.org/acme/order/18231387/247245516) (ca=https://acme-staging-v02.api.letsencrypt.org/directory)","attempt":4,"retrying_in":300,"elapsed":309.185046944,"max_duration":2592000}
{"level":"error","ts":1614282660.824008,"logger":"tls.issuance.acme.acme_client","msg":"cleaning up solver","identifier":"lowarya.net","challenge_type":"dns-01","error":"no memory of presenting a DNS record for lowarya.net (probably OK if presenting failed)"}
{"level":"error","ts":1614282661.472535,"logger":"tls.obtain","msg":"will retry","error":"[lowarya.net] Obtain: [lowarya.net] solving challenges: presenting for challenge: adding temporary record for zone lowarya.net.: got error status: HTTP 400: [{Code:6003 Message:Invalid request headers}] (order=https://acme-staging-v02.api.letsencrypt.org/acme/order/18231387/247245526) (ca=https://acme-staging-v02.api.letsencrypt.org/directory)","attempt":4,"retrying_in":300,"elapsed":310.345742472,"max_duration":2592000}
{"level":"info","ts":1614282961.214291,"logger":"tls.issuance.acme.acme_client","msg":"trying to solve challenge","identifier":"www.lowarya.net","challenge_type":"dns-01","ca":"https://acme-staging-v02.api.letsencrypt.org/directory"}
{"level":"error","ts":1614282962.0535383,"logger":"tls.issuance.acme.acme_client","msg":"cleaning up solver","identifier":"www.lowarya.net","challenge_type":"dns-01","error":"no memory of presenting a DNS record for www.lowarya.net (probably OK if presenting failed)"}
{"level":"error","ts":1614282962.1968896,"logger":"tls.obtain","msg":"will retry","error":"[www.lowarya.net] Obtain: [www.lowarya.net] solving challenges: presenting for challenge: adding temporary record for zone lowarya.net.: got error status: HTTP 400: [{Code:6003 Message:Invalid request headers}] (order=https://acme-staging-v02.api.letsencrypt.org/acme/order/18231387/247247952) (ca=https://acme-staging-v02.api.letsencrypt.org/directory)","attempt":5,"retrying_in":600,"elapsed":611.07044295,"max_duration":2592000}
{"level":"info","ts":1614282962.3521876,"logger":"tls.issuance.acme.acme_client","msg":"trying to solve challenge","identifier":"lowarya.net","challenge_type":"dns-01","ca":"https://acme-staging-v02.api.letsencrypt.org/directory"}
{"level":"error","ts":1614282963.4611344,"logger":"tls.issuance.acme.acme_client","msg":"cleaning up solver","identifier":"lowarya.net","challenge_type":"dns-01","error":"no memory of presenting a DNS record for lowarya.net (probably OK if presenting failed)"}
{"level":"error","ts":1614282963.6067624,"logger":"tls.obtain","msg":"will retry","error":"[lowarya.net] Obtain: [lowarya.net] solving challenges: presenting for challenge: adding temporary record for zone lowarya.net.: got error status: HTTP 400: [{Code:6003 Message:Invalid request headers}] (order=https://acme-staging-v02.api.letsencrypt.org/acme/order/18231387/247247962) (ca=https://acme-staging-v02.api.letsencrypt.org/directory)","attempt":5,"retrying_in":600,"elapsed":612.479969616,"max_duration":2592000}