Sending an ACME HTTP validation request to zoo100.ru 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: https://zoo100.ru.well-known/acme-challenge/letsdebug-test. Check your web server configuration and .htaccess for Redirect/RedirectMatch/RewriteRule.
Trace:
@0ms: Making a request to http://zoo100.ru/.well-known/acme-challenge/letsdebug-test (using initial IP 88.198.203.28)
@0ms: Dialing 88.198.203.28
@183ms: Server response: HTTP 301 Moved Permanently
@183ms: Received redirect to https://zoo100.ru.well-known/acme-challenge/letsdebug-test
Requests made to the domain
Request to: zoo100.ru/88.198.203.28, Result: [Address Type=IPv4,Server=nginx,HTTP Status=301,Number of Redirects=1,Final HTTP Status=301], Issue: BadRedirect
Trace:
@0ms: Making a request to http://zoo100.ru/.well-known/acme-challenge/letsdebug-test (using initial IP 88.198.203.28)
@0ms: Dialing 88.198.203.28
@183ms: Server response: HTTP 301 Moved Permanently
@183ms: Received redirect to https://zoo100.ru.well-known/acme-challenge/letsdebug-test
A and AAAA records found for this domain
zoo100.ru. 0 IN A 88.198.203.28
Challenge update failures for zoo100.ru in order https://acme-staging-v02.api.letsencrypt.org/acme/order/5751349/1760149
acme: error code 400 "urn:ietf:params:acme:error:connection": Fetching https://zoo100.ru.well-known/acme-challenge/AI0domxLsDUGIyAwiLV8HcjdSNZMLK8L72RX13_R_JY: Error getting validation data
The IANA public suffix is the TLD of the Registered Domain
The TLD for zoo100.ru is: ru
The current status.io status for Let's Encrypt
Operational