Client Not Able to Register

Do you have Enhanced Security turned on in your 10.x deployment (shown in BESAdmin tool)? Did you ever?

Enabling Enhanced Security activates TLS 1.2 , and I believe once that’s done there’s no going back. I’m not sure whether the 8.x client supported TLS 1.2.

But if that was the case I’d expect a TLS error rather than an HTTP 403 error…but I’m not not certain how it would look on an 8.x client log honestly.

I also don’t think you can edit the actionsite.afxm file directly - it’s digitally signed so an edit from http to https should fail signature validation anyway, which might be the error you’re seeing after modifying the file.

the BESAdmin Security tab says “Enhanced Security is currently DISABLED”, and I’ve never enabled it.
It’s just strange that SSL /TLS would be in the mix when the client log only references http.