JetPack Connection – sslv3 handshake failure – Solution Check?

I am working on a new (freshly installed) WPMS at https://tivism.com and am trying to get Jetpack setup on my network.

I have been getting an error though, and it has taken my host (SiteGround.com) awhile to find a potential solution.

The error shows after clicking ‘Connect’ for Jetpack, from the network admin, or from any network subsite.

The error reads:

Your website needs to be publicly accessible to use Jetpack: site_inaccessible
Error Details: The Jetpack server was unable to communicate with your site https://tivism.com [IXR -32300: transport error: http_request_failed error:14094410:SSL routines:SSL3_READ_BYTES:sslv3 alert handshake failure]

The error shows when I have a network setup with subdomains or subdirectories. We have reinstalled many, many times at this point.

At first my host thought this was due to an SSL misconfiguration. We have verified that all is setup correctly with my SSL.

This issue has been escalated to my host’s Senior Third-Level support team members.

Currently, the solution they have identified is as follows:

After numerous attempts I think I have managed to resolve the issue.

Since the POST requests made by the JetPack system have failed I have looked closely at the code.

I have manually changed the following line in the wp-config.php file from:

define('DOMAIN_CURRENT_SITE', 'tivism.com');

Changed to:

define('DOMAIN_CURRENT_SITE', 'https://tivism.com');

Then I have managed to reach the Jetpack WordPress login page.

I can see how this could have fixed things, but am not sure if this is a best-practice approach.

However, I am now seeing two significant issues that may be related to whatever changes my host has tried making.

Firstly, though I did NOT setup my WP to use ‘www’ the now-reachable jetpack.wordpress.com page is showing my url as https://www.tivism.com though I cannot find where any value has been changed to include ‘www’ – I checked wp-config and looked in the db to no avail.

Secondly, once logged in to the primary site, I cannot visit the network admin area.

Internal menu links point to
https://https//tivism.com/wp-admin/network/

and manually navigating to
https://tivism.com/wp-admin/network/
redirects to
https://https//tivism.com/wp-admin/network/

Further, I have sought input from WPMUDev at the following thread:
https://premium.wpmudev.org/forums/topic/jetpack-conection-error-w-ssl-help-evaluate-hosts-solution-please

So far, WPMUDev support has suggested:

This sounds more like the server is rejecting connections through https, maybe some config with Curl or firewall rules possibly with DDOS prevention? not sure, but either way this does suggest that your server is rejecting the connection itself.
Have you tried the method suggested on the following article, which might help?
https://www.oncry.com/resolved-register_http_request_failed-error-of-jetpack-plugin/

Any insight y’all may have into this issue will be greatly appreciated.

Many Thanks & Kind Regards,
Max