Argo site reports "This site can’t provide a secure connection" in Chrome

[nirving]

# This site can’t provide a secure connection

**vault.pki.xxxxx.xxx**  uses an unsupported protocol.

ERR_SSL_VERSION_OR_CIPHER_MISMATCH

All setup via CNAME records and works for other subdomains. If I use vault.xxxxx.xxx then that works. Any ideas?

[sdayman]

Subdomain too deep

This tutorial covers a possible reason for the SSL_ERROR_NO_CYPHER_OVERLAP and ERR_SSL_VERSION_OR_CIPHER_MISMATCH errors (Firefox and Chrome respectively) when seen on a subdomain. The Cloudflare universal certificates cover example.com and *.example.com. This means that it covers any subdomain one level below the domain you signed up with. It will cover www.example.com and subdomain.example.com, as these are one level below the root domain, example.com. The certificate will not cover www.sub…

[nirving]

I have paid for a domain SSL Cerrtificate and I have just checked it does not include that subdomain. Let me add it and see what happens then. Thanks for the pointer as I thought I had it there already.

Edit: Checked and it was missing from the SSL Certificate. Deleted and placed a new order and it resolved the issue. Missed that.

Thanks @sdayman