In short:
I have a couple of ESXi6 servers in a LAN on which I can successfully load the page https://host.tld/ in a browser. On one ESXi6 server, which is publicly available on the internet, I get 403 forbidden when loading the page in a browser.
More detailed description:
VEEAM B&R cannot connect to the WAN ESXi6.0.0 (5572656) due a 403 reply from ESXi's httpd (which I confirmed using a browser to https://host.tld/). Accessing https://host.tld works on all my local ESXi servers, but not on the WAN ESXi server. (However, VSphere works fine on all servers.) Because this server is exposed to the internet, it is possible that I may have configured it to be locked down when I initially set it up years ago, but I if that's the case I must have missed to write a documentation and now just forgot how I did it.
The fact that the browser receives a 403 indicates that there is actually some http(s) going on, so I don't think it's the firewall.
Where in ESXi6 can http access be configured?
Thanks in advance!
T.