Let's Debug

Test result for oleum.net using http-01

Debug
Requests made to the domain
Request to: oleum.net/78.143.193.253, Result: [Address=78.143.193.253,Address Type=IPv4,Server=Apache/2.4.41 (Ubuntu),HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://oleum.net/.well-known/acme-challenge/letsdebug-test (using initial IP 78.143.193.253)
@2ms: Dialing 78.143.193.253
@156ms: Server response: HTTP 404 Not Found

Debug
A and AAAA records found for this domain
oleum.net. 0 IN A 78.143.193.253
Challenge update failures for oleum.net in order https://acme-staging-v02.api.letsencrypt.org/acme/order/5751349/136233445
acme: error code 403 "urn:ietf:params:acme:error:unauthorized": Invalid response from http://oleum.net/.well-known/acme-challenge/vprl4J8CGa5cCcaHOxwmPRCWiG5LnG3okxCB_QQO3HE [78.143.193.253]: "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n<html><head>\n<title>404 Not Found</title>\n</head><body>\n<h1>Not Found</h1>\n<p"
Debug
The IANA public suffix is the TLD of the Registered Domain
The TLD for oleum.net is: net
Debug
The current status.io status for Let's Encrypt
Operational

Submitted Aug 23 18:12:16 2020. Sat in queue for 3ms. Completed in 4s. Hide verbose information.