Let's Debug

Test result for foo.monkas.xyz using http-01

Error
Sending an ACME HTTP validation request to foo.monkas.xyz results in an unacceptable redirect. This is most likely a misconfiguration of your web server or your web application.
It appears that a redirect was generated by your web server that is missing a trailing slash after your domain name: http://foo.monkas.xyz.well-known/acme-challenge/letsdebug-test. Check your web server configuration and .htaccess for Redirect/RedirectMatch/RewriteRule.

Trace:
> Making a request to http://foo.monkas.xyz/.well-known/acme-challenge/letsdebug-test (using initial IP 2607:5300:201:3100::24e5)
> Dialing 2607:5300:201:3100::24e5
> Received redirect to http://foo.monkas.xyz.well-known/acme-challenge/letsdebug-test
Error
Sending an ACME HTTP validation request to foo.monkas.xyz results in an unacceptable redirect. This is most likely a misconfiguration of your web server or your web application.
It appears that a redirect was generated by your web server that is missing a trailing slash after your domain name: http://foo.monkas.xyz.well-known/acme-challenge/letsdebug-test. Check your web server configuration and .htaccess for Redirect/RedirectMatch/RewriteRule.

Trace:
> Making a request to http://foo.monkas.xyz/.well-known/acme-challenge/letsdebug-test (using initial IP 149.56.101.173)
> Dialing 149.56.101.173
> Received redirect to http://foo.monkas.xyz.well-known/acme-challenge/letsdebug-test
Debug
CAA records control authorization for certificate authorities to issue certificates for a domain
monkas.xyz. 0 IN CAA 0 issue "letsencrypt.org; validation-methods=http-01"
Debug
Requests made to the domain
Request to: foo.monkas.xyz/2607:5300:201:3100::24e5, Result: [Address Type=IPv6,Response Code=302,Server=Apache], Issue: BadRedirect
Request to: foo.monkas.xyz/149.56.101.173, Result: [Address Type=IPv4,Response Code=302,Server=Apache], Issue: BadRedirect
Debug
A and AAAA records found for this domain
foo.monkas.xyz. 0 IN A 149.56.101.173
foo.monkas.xyz. 0 IN AAAA 2607:5300:201:3100::24e5
Challenge update failures for foo.monkas.xyz in order https://acme-staging-v02.api.letsencrypt.org/acme/order/5751349/623503
acme: error code 403 "urn:ietf:params:acme:error:unauthorized": Invalid response from http://foo.monkas.xyz/.well-known/acme-challenge/xDst6QDY3izy3FtoePbKbhqJ6BKkr3z41EksIujF9Qs: "<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>404 Not Found</title>
</head><body>
<h1>Not Found</h1>
<p"
Debug
The IANA public suffix is the TLD of the Registered Domain
The TLD for foo.monkas.xyz is: xyz
Debug
The current status.io status for Let's Encrypt
Operational

Submitted Apr 30 01:46:40 2018. Sat in queue for 3ms. Completed in 2s. Hide verbose information.