HAProxy: website loads only in some browsers

[jonf]

Greetings,

I have Nextcloud setup on my home server and I want to be able to access it from both inside and outside my network via my DDNS hostname, which I've managed to get working...sort of.

It loads the login page fine if I use Firefox, Chrome or Brave (Chromium-based). But it turns out not all browsers are created equally after all...well either that or my configuration is wrong somewhere.  If I use Microsoft Edge it takes its time to give the error text "ERR_CONNECTION_TIMED_OUT", which is weird since it's now also Chromium-based. I also tested with a couple of mobile browsers including Samsung Internet Browser, SmartCookieWeb (both of which timed out in similar fashion), and Bromite (Chromium-based, this one works).

What could Firefox and Chrome be doing to load it which apparently Edge cannot do? Is this even an HAProxy issue? Any ideas?