Big-IQ 400 response on Mgmt incoming connections

Hello guys!

I have a Big-IP (LTM) in the border of our lab, for all incoming connections (mostly for mgmt access).

Something like this:

As you can see, we have 4 VS with 1 member each.

3 of those members are running 443 for mgmt purposes, however I have them published in the Internet with different incoming ports, like this:

Now, for all of them I have configured TCP profile, NO ssl profile (client or server).

For VS-PAN-5050 and VS-ESXi-Server, I am able to https://Public-IP:443X via browser from anywhere.

When it comes to the VS-Big-IQ, I try: https://Public-IP:4433 and I receive a "400 bad request" after confirming exception for the certificate and so on...

My question would be: why?

Why the does it work for some VS and for the Big-IQ doesn't?

I do have access via internal ip to the Big-IQ.

Important note: This Big-IP is configured to be managed for the Big-IQ. I don't know if there's any conflict with that configuration.

Regards.