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