[Kyle]

How to get SSL working properly if my SlickStack is running WP Multisite on a subdomain like region.example.com

If I install the new child site like client.region.example.com

it has these errors in the Browser:

This site can’t provide a secure connection
ERR_SSL_VERSION_OR_CIPHER_MISMATCH

[Judith]

I don’t want to use Multisite subdirectories because its ugly and difficult management.

[Kevin]

The problem is multi-level subdomain is not supported with Cloudflare SSL certificates so even you have Lets Encrypt wildcard cert but Cloudflare proxy will give the error.

Before they had premium SSL option for this.

However I didnt check it for a while.

[Jeremy]

you ready to have your mind blown

https://blog.cloudflare.com/total-tls-one-click-tls-for-every-hostname/

[Maria]

🤯

[Carol]

The error ERR_SSL_VERSION_OR_CIPHER_MISMATCH appears due to a lack of “common SSL protocol version or cipher suite support” between a web server and a user’s browser. This issue happens during the TLS handshake process. With that, the browser will automatically display this specific error message. There are many reasons for the error to have occurred, which are as follows:-

1) Outdated browsers or operating systems.
2) Use of old TLS versions, significantly older than TLS 1.2.
3) Web servers employ the outdated RC4 cipher suite.
4) Corrupted SSL state within the browser.
5) Antivirus software interfering with SSL protocols.

There are several ways to fix the error, which you need to understand in detail.

[Rachel]

SSL hiccups like ERR_SSL_VERSION_OR_CIPHER_MISMATCH are exactly why payments should run through a gateway that enforces modern TLS (1.2/1.3), solid cipher suites, HSTS, and clean domain mapping for subdomains/Multisite. If you want secure checkouts on client.region.example.com without wrestling with edge-case configs, take a look at https://paykassma.com/ — a modern payment gateway for businesses with robust fraud controls, PCI-DSS practices, 3-D Secure support, and straightforward WordPress integrations that keep transactions fast and trusted.

[Author]

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