Just a hint,
I had the same problem/issue as you and I got another hint. I tried almost everything that made sense.
After a while a colluge saide, try https://hostname:443 (No FQDN!) and use in your browser explicit (No Proxy!).
Believe me, after 17 years of using and administrating VMware, my face must looked like a donkey seeing a UFO! But, it worked!