The domain www.iotplayground.tk is being served through Cloudflare CDN. Any Let's Encrypt certificate installed on the origin server will only encrypt traffic between the server and Cloudflare. It is strongly recommended that the SSL option 'Full SSL (strict)' be enabled.
https://support.cloudflare.com/hc/en-us/articles/200170416-What-do-the-SSL-options-mean-
Requests made to the domain
Request to: www.iotplayground.tk/2606:4700:3031::681b:88d1, Result: [Address=2606:4700:3031::681b:88d1,Address Type=IPv6,Server=cloudflare,HTTP Status=500], Issue:
Trace:
@0ms: Making a request to http://www.iotplayground.tk/.well-known/acme-challenge/letsdebug-test (using initial IP 2606:4700:3031::681b:88d1)
@0ms: Dialing 2606:4700:3031::681b:88d1
@3037ms: Server response: HTTP 500 Internal Server Error
Request to: www.iotplayground.tk/2606:4700:3031::681b:89d1, Result: [Address=2606:4700:3031::681b:89d1,Address Type=IPv6,Server=cloudflare,HTTP Status=500], Issue:
Trace:
@0ms: Making a request to http://www.iotplayground.tk/.well-known/acme-challenge/letsdebug-test (using initial IP 2606:4700:3031::681b:89d1)
@0ms: Dialing 2606:4700:3031::681b:89d1
@405ms: Server response: HTTP 500 Internal Server Error
Request to: www.iotplayground.tk/2606:4700:3035::ac43:a8f3, Result: [Address=2606:4700:3035::ac43:a8f3,Address Type=IPv6,Server=cloudflare,HTTP Status=500], Issue:
Trace:
@0ms: Making a request to http://www.iotplayground.tk/.well-known/acme-challenge/letsdebug-test (using initial IP 2606:4700:3035::ac43:a8f3)
@0ms: Dialing 2606:4700:3035::ac43:a8f3
@307ms: Server response: HTTP 500 Internal Server Error
Request to: www.iotplayground.tk/172.67.168.243, Result: [Address=172.67.168.243,Address Type=IPv4,Server=cloudflare,HTTP Status=500], Issue:
Trace:
@0ms: Making a request to http://www.iotplayground.tk/.well-known/acme-challenge/letsdebug-test (using initial IP 172.67.168.243)
@0ms: Dialing 172.67.168.243
@338ms: Server response: HTTP 500 Internal Server Error
Request to: www.iotplayground.tk/104.27.136.209, Result: [Address=104.27.136.209,Address Type=IPv4,Server=cloudflare,HTTP Status=500], Issue:
Trace:
@0ms: Making a request to http://www.iotplayground.tk/.well-known/acme-challenge/letsdebug-test (using initial IP 104.27.136.209)
@0ms: Dialing 104.27.136.209
@372ms: Server response: HTTP 500 Internal Server Error
Request to: www.iotplayground.tk/104.27.137.209, Result: [Address=104.27.137.209,Address Type=IPv4,Server=cloudflare,HTTP Status=500], Issue:
Trace:
@0ms: Making a request to http://www.iotplayground.tk/.well-known/acme-challenge/letsdebug-test (using initial IP 104.27.137.209)
@0ms: Dialing 104.27.137.209
@312ms: Server response: HTTP 500 Internal Server Error
A and AAAA records found for this domain
www.iotplayground.tk. 0 IN A 172.67.168.243
www.iotplayground.tk. 0 IN A 104.27.136.209
www.iotplayground.tk. 0 IN A 104.27.137.209
www.iotplayground.tk. 0 IN AAAA 2606:4700:3031::681b:88d1
www.iotplayground.tk. 0 IN AAAA 2606:4700:3031::681b:89d1
www.iotplayground.tk. 0 IN AAAA 2606:4700:3035::ac43:a8f3
An internal error occurred while checking the domain
Failed to query certwatch database to check rate limits: pq: canceling statement due to user request
Challenge update failures for www.iotplayground.tk in order https://acme-staging-v02.api.letsencrypt.org/acme/order/5751349/213583170
acme: error code 403 "urn:ietf:params:acme:error:unauthorized": Invalid response from http://www.iotplayground.tk/.well-known/acme-challenge/Cz0QY8M1bVHZYMTZP64kg2hQnTFuMxB24pI8EBqAnnE [2606:4700:3031::681b:89d1]: "<!DOCTYPE html>\r\n<html>\r\n <head>\r\n <title>Não foi possível localizar o arquivo 'C:\\Sites\\www.iotplayground.t"