Firefox "SSL_ERROR_RX_RECORD_TOO_LONG. Chrome: "This site can’t provide a secure connection"

Website, Application, Performance Security
1

My site won’t open. My Firefox browser reports "SSL_ERROR_RX_RECORD_TOO_LONG. My Chrome browser reports this error: "This site can’t provide a secure connection www.aprilkullis.com sent an invalid response. ERR_SSL_PROTOCOL_ERROR.

4

Appears to resolve and present a valid certificate when I test:

curl -Ikv https://www.aprilkullis.com
*   Trying 172.67.215.123:443...
* Connected to www.aprilkullis.com (172.67.215.123) port 443 (#0)
* ALPN: offers h2,http/1.1
* (304) (OUT), TLS handshake, Client hello (1):
* (304) (IN), TLS handshake, Server hello (2):
* (304) (IN), TLS handshake, Unknown (8):
* (304) (IN), TLS handshake, Certificate (11):
* (304) (IN), TLS handshake, CERT verify (15):
* (304) (IN), TLS handshake, Finished (20):
* (304) (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / AEAD-CHACHA20-POLY1305-SHA256
* ALPN: server accepted h2
* Server certificate:
*  subject: CN=aprilkullis.com
*  start date: Sep  7 04:00:47 2023 GMT
*  expire date: Dec  6 04:00:46 2023 GMT
*  issuer: C=US; O=Let's Encrypt; CN=E1
*  SSL certificate verify ok.
* using HTTP/2
* h2 [:method: HEAD]
* h2 [:scheme: https]
* h2 [:authority: www.aprilkullis.com]
* h2 [:path: /]
* h2 [user-agent: curl/8.1.2]
* h2 [accept: */*]
* Using Stream ID: 1 (easy handle 0x136810a00)
> HEAD / HTTP/2
> Host: www.aprilkullis.com
> User-Agent: curl/8.1.2
> Accept: */*
>
< HTTP/2 200
HTTP/2 200
< date: Mon, 30 Oct 2023 20:29:50 GMT
date: Mon, 30 Oct 2023 20:29:50 GMT
< content-type: text/html
content-type: text/html
< last-modified: Mon, 30 Oct 2023 20:24:33 GMT
last-modified: Mon, 30 Oct 2023 20:24:33 GMT
< vary: Accept-Encoding
vary: Accept-Encoding
< cf-cache-status: DYNAMIC
5

We continue to get the error codes on all browsers.
What else can it be?

6

Cached DNS? What happens if you execute the same curl command?

7

You are talking over my head here. I have been on Cloudflare for four years without issue. This happened a couple of days ago after I uploaded new pages.

8

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