HTTP01 Validation not working in 4.1.8.0

Certs where working fine until this month i get errors:

https://letsdebug.net/rdsgw.elgo.be/131591 is saying everything is ok.

2020-05-04 15:41:17.000 +02:00 [INF] All Tests Completed OK
2020-05-04 15:47:37.016 +02:00 [INF] Certify/4.1.8.0 (Windows; Microsoft Windows NT 6.2.9200.0)
2020-05-04 15:47:37.016 +02:00 [INF] Beginning Certificate Request Process: rdsgw.elgo.be using ACME Provider:Certes
2020-05-04 15:47:37.018 +02:00 [INF] Registering Domain Identifiers
2020-05-04 15:47:37.019 +02:00 [ERR] BeginCertificateOrder: creating/retrieving order. Retries remaining:2
2020-05-04 15:47:38.926 +02:00 [INF] Created ACME Order: https://acme-v02.api.letsencrypt.org/acme/order/78018578/3236610175
2020-05-04 15:47:39.242 +02:00 [INF] Fetching Authorizations.
2020-05-04 15:47:41.130 +02:00 [INF] Got http-01 challenge https://acme-v02.api.letsencrypt.org/acme/chall-v3/4359968122/PC1fxQ
2020-05-04 15:47:41.774 +02:00 [INF] Got dns-01 challenge https://acme-v02.api.letsencrypt.org/acme/chall-v3/4359968122/K65P8g
2020-05-04 15:47:42.792 +02:00 [INF] Http Challenge Server process available.
2020-05-04 15:47:42.792 +02:00 [INF] Attempting Domain Validation: rdsgw.elgo.be
2020-05-04 15:47:42.793 +02:00 [INF] Registering and Validating rdsgw.elgo.be
2020-05-04 15:47:42.793 +02:00 [INF] Performing automated challenge responses (rdsgw.elgo.be)
2020-05-04 15:47:42.793 +02:00 [INF] Preparing challenge response for Let’s Encrypt server to check at: http://rdsgw.elgo.be/.well-known/acme-challenge/xpnjB_ez44nPO4NloDzzXixsC1Zqzdd_cdlX35vPwpo with content xpnjB_ez44nPO4NloDzzXixsC1Zqzdd_cdlX35vPwpo.OpSjMKykYklLowdUQxZmXll63YJSW1G2JNnBzIY7aAY
2020-05-04 15:47:42.793 +02:00 [INF] If the challenge response file is not accessible at this exact URL the validation will fail and a certificate will not be issued.
2020-05-04 15:47:42.822 +02:00 [INF] Using website path C:\inetpub\wwwroot
2020-05-04 15:47:42.824 +02:00 [INF] Checking URL is accessible: http://rdsgw.elgo.be/.well-known/acme-challenge/xpnjB_ez44nPO4NloDzzXixsC1Zqzdd_cdlX35vPwpo [proxyAPI: True, timeout: 5000ms]
2020-05-04 15:47:44.843 +02:00 [INF] (proxy api) URL is not accessible. Result: [404] Resource not accessible, Timeout or Redirected
2020-05-04 15:47:44.843 +02:00 [INF] Checking URL is accessible: http://rdsgw.elgo.be/.well-known/acme-challenge/xpnjB_ez44nPO4NloDzzXixsC1Zqzdd_cdlX35vPwpo [proxyAPI: False, timeout: 5000ms]
2020-05-04 15:47:45.047 +02:00 [INF] (local check) URL is accessible. Check passed. HTTP OK
2020-05-04 15:47:45.047 +02:00 [INF] Requesting Validation from Let’s Encrypt: rdsgw.elgo.be
2020-05-04 15:47:45.047 +02:00 [INF] Attempting Challenge Response Validation for Domain: rdsgw.elgo.be
2020-05-04 15:47:45.048 +02:00 [INF] Registering and Validating rdsgw.elgo.be
2020-05-04 15:47:45.048 +02:00 [INF] Checking automated challenge response for Domain: rdsgw.elgo.be
2020-05-04 15:47:46.506 +02:00 [INF] Invalid response from http://rdsgw.elgo.be/.well-known/acme-challenge/xpnjB_ez44nPO4NloDzzXixsC1Zqzdd_cdlX35vPwpo [84.192.241.47]: "\r\n<html xmlns=“http”
2020-05-04 15:47:48.452 +02:00 [INF] Validation of the required challenges did not complete successfully. Invalid response from http://rdsgw.elgo.be/.well-known/acme-challenge/xpnjB_ez44nPO4NloDzzXixsC1Zqzdd_cdlX35vPwpo [84.192.241.47]: "\r\n<html xmlns=“http”
2020-05-04 15:47:48.453 +02:00 [INF] Validation of the required challenges did not complete successfully. Invalid response from http://rdsgw.elgo.be/.well-known/acme-challenge/xpnjB_ez44nPO4NloDzzXixsC1Zqzdd_cdlX35vPwpo [84.192.241.47]: "\r\n<html xmlns=“http”
2020-05-04 15:48:41.569 +02:00 [INF] Post-Request Script output:

There is a timeout trying to reach your site via HTTP.

You may be using some sort of GeoLocation blocking device/service or IPS that is blocking some IPs from reaching your site for HTTP. [This is NOT good/best practice]

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