SSL issue

Hello,

I am unable to reproduce an SSL error when using Curl to test your hostname. I am using the test URL for your hostname and am successfully able to view it in my browser and find the curl test results below :

curl -Iv https://mx36fad4pwmz.cdn.shift8web.com/wp-content/plugins/shift8-cdn/test/test.png
* Host mx36fad4pwmz.cdn.shift8web.com:443 was resolved.
* IPv6: (none)
* IPv4: 149.248.55.249
*   Trying 149.248.55.249:443...
* Connected to mx36fad4pwmz.cdn.shift8web.com (149.248.55.249) port 443
* ALPN: curl offers h2,http/1.1
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
*  CAfile: /etc/ssl/certs/ca-certificates.crt
*  CApath: /etc/ssl/certs
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_128_GCM_SHA256 / X25519 / RSASSA-PSS
* ALPN: server accepted h2
* Server certificate:
*  subject: CN=*.cdn.shift8web.com
*  start date: May 22 00:00:00 2025 GMT
*  expire date: May 21 23:59:59 2026 GMT
*  subjectAltName: host "mx36fad4pwmz.cdn.shift8web.com" matched cert's "*.cdn.shift8web.com"
*  issuer: C=US; O=DigiCert Inc; OU=www.digicert.com; CN=RapidSSL TLS RSA CA G1
*  SSL certificate verify ok.
*   Certificate level 0: Public key type RSA (2048/112 Bits/secBits), signed using sha256WithRSAEncryption
*   Certificate level 1: Public key type RSA (2048/112 Bits/secBits), signed using sha256WithRSAEncryption
*   Certificate level 2: Public key type RSA (2048/112 Bits/secBits), signed using sha256WithRSAEncryption
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* using HTTP/2
* [HTTP/2] [1] OPENED stream for https://mx36fad4pwmz.cdn.shift8web.com/wp-content/plugins/shift8-cdn/test/test.png
* [HTTP/2] [1] [:method: HEAD]
* [HTTP/2] [1] [:scheme: https]
* [HTTP/2] [1] [:authority: mx36fad4pwmz.cdn.shift8web.com]
* [HTTP/2] [1] [:path: /wp-content/plugins/shift8-cdn/test/test.png]
* [HTTP/2] [1] [user-agent: curl/8.5.0]
* [HTTP/2] [1] [accept: */*]
> HEAD /wp-content/plugins/shift8-cdn/test/test.png HTTP/2
> Host: mx36fad4pwmz.cdn.shift8web.com
> User-Agent: curl/8.5.0
> Accept: */*
> 
< HTTP/2 200 
HTTP/2 200 
< accept-ranges: bytes
accept-ranges: bytes
< access-control-allow-origin: https://www.kraemerladen.bio
access-control-allow-origin: https://www.kraemerladen.bio
< alt-svc: h3=":443"; ma=2592000,h3=":443"; ma=2592000
alt-svc: h3=":443"; ma=2592000,h3=":443"; ma=2592000
< cache-control: max-age=31536000
cache-control: max-age=31536000
< content-type: image/png
content-type: image/png
< date: Tue, 30 Dec 2025 15:25:16 GMT
date: Tue, 30 Dec 2025 15:25:16 GMT
< expires: Wed, 30 Dec 2026 15:25:16 GMT
expires: Wed, 30 Dec 2026 15:25:16 GMT
< last-modified: Wed, 10 Dec 2025 04:59:40 GMT
last-modified: Wed, 10 Dec 2025 04:59:40 GMT
< pragma: public
pragma: public
< server: Shift8_CDN
server: Shift8_CDN
< vary: Accept-Encoding
vary: Accept-Encoding
< via: 2.0 Caddy
via: 2.0 Caddy
< x-shift8cdn-cache: HIT
x-shift8cdn-cache: HIT
< content-length: 90154
content-length: 90154

< 
* Connection #0 to host mx36fad4pwmz.cdn.shift8web.com left intact

Can you do me a favour and ping mx36fad4pwmz.cdn.shift8web.com and confirm which IP address resolves when you ping it?

Sorry a bout the delay in my response , the Frankfurt based IP that you provided doesnt show any SSL errors for me :

# curl -Iv https://mx36fad4pwmz.cdn.shift8web.com/wp-content/plugins/shift8-cdn/test/test.png
* Host mx36fad4pwmz.cdn.shift8web.com:443 was resolved.
* IPv6: (none)
* IPv4: 139.162.154.220
*   Trying 139.162.154.220:443...
* Connected to mx36fad4pwmz.cdn.shift8web.com (139.162.154.220) port 443
* ALPN: curl offers h2,http/1.1
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
*  CAfile: /etc/ssl/certs/ca-certificates.crt
*  CApath: /etc/ssl/certs
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_128_GCM_SHA256 / X25519 / RSASSA-PSS
* ALPN: server accepted h2
* Server certificate:
*  subject: CN=*.cdn.shift8web.com
*  start date: May 22 00:00:00 2025 GMT
*  expire date: May 21 23:59:59 2026 GMT
*  subjectAltName: host "mx36fad4pwmz.cdn.shift8web.com" matched cert's "*.cdn.shift8web.com"
*  issuer: C=US; O=DigiCert Inc; OU=www.digicert.com; CN=RapidSSL TLS RSA CA G1
*  SSL certificate verify ok.
*   Certificate level 0: Public key type RSA (2048/112 Bits/secBits), signed using sha256WithRSAEncryption
*   Certificate level 1: Public key type RSA (2048/112 Bits/secBits), signed using sha256WithRSAEncryption
*   Certificate level 2: Public key type RSA (2048/112 Bits/secBits), signed using sha256WithRSAEncryption
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* using HTTP/2
* [HTTP/2] [1] OPENED stream for https://mx36fad4pwmz.cdn.shift8web.com/wp-content/plugins/shift8-cdn/test/test.png
* [HTTP/2] [1] [:method: HEAD]
* [HTTP/2] [1] [:scheme: https]
* [HTTP/2] [1] [:authority: mx36fad4pwmz.cdn.shift8web.com]
* [HTTP/2] [1] [:path: /wp-content/plugins/shift8-cdn/test/test.png]
* [HTTP/2] [1] [user-agent: curl/8.5.0]
* [HTTP/2] [1] [accept: */*]
> HEAD /wp-content/plugins/shift8-cdn/test/test.png HTTP/2
> Host: mx36fad4pwmz.cdn.shift8web.com
> User-Agent: curl/8.5.0
> Accept: */*
> 
< HTTP/2 200 
HTTP/2 200 
< accept-ranges: bytes
accept-ranges: bytes
< access-control-allow-origin: https://www.kraemerladen.bio
access-control-allow-origin: https://www.kraemerladen.bio
< alt-svc: h3=":443"; ma=2592000,h3=":443"; ma=2592000
alt-svc: h3=":443"; ma=2592000,h3=":443"; ma=2592000
< cache-control: max-age=31536000
cache-control: max-age=31536000
< content-type: image/png
content-type: image/png
< date: Wed, 21 Jan 2026 11:52:12 GMT
date: Wed, 21 Jan 2026 11:52:12 GMT
< expires: Thu, 21 Jan 2027 11:52:12 GMT
expires: Thu, 21 Jan 2027 11:52:12 GMT
< last-modified: Wed, 10 Dec 2025 04:59:40 GMT
last-modified: Wed, 10 Dec 2025 04:59:40 GMT
< pragma: public
pragma: public
< server: Shift8_CDN
server: Shift8_CDN
< vary: Accept-Encoding
vary: Accept-Encoding
< via: AtomicEdge
via: AtomicEdge
< x-shift8cdn-cache: HIT
x-shift8cdn-cache: HIT
< content-length: 90154
content-length: 90154

< 
* Connection #0 to host mx36fad4pwmz.cdn.shift8web.com left intact

Can you confirm if this issue is still happening to you?

actually my website shows heaps of “loading failed” for the resources from shift8cdn.

Can you provide a full screenshot of the response in your browser?

The test URL works for me : https://mx36fad4pwmz.cdn.shift8web.com/wp-content/plugins/shift8-cdn/test/test.png

Can you also paste the output of the Shift8 CDN plugin > Support tab “Debug info” here?