I can't help your query bud but I am surprised at your comment on their support as its always been brilliant IME
Dave
Microsoft gave up on supporting Internet Explorer more than 5 years ago so I don't get why are you worrying about supporting this obsolete web browser.
Well, having spent 15 minutes firing up the wife's Windows 10 laptop which then does updates and then takes an age to even load IE (hateful operating system), I get a password prompt when I try for that image.
When I check your web server itself it is giving the correct response so not sure what else I can offer. I wonder if IE has some security settings that prevent unencrypted passwords?
You mention now a school, potentially there is a firewall in play or their IE versions are locked down to not permit unencrypted passwords - I dunno. Maybe if someone else on the list that does have IE (I feel for you...) can try that URL and report back if it throws up a password prompt? This one: http://www.kipax.com/gallery/albums/SCHOOLS_BD/5351/005_1622_2271_r_y2.jpg
I've tried this on my IE 11 and I get the same behaviour as you @KIPAX . A bit of googling got me to this
https://webmasters.stackexchange.co...s-work-for-all-browsers-but-internet-explorer
Ok, so now I fired one of the desktops up yes I see the same as you with IE, when you go to the gallery page a box with all sorts of stuff in appears in the middle and the password protected image should appear at the top and does not. There is no password prompt in IE (or Edge or whatever they renamed it). But no matter how much I pour over the code I cannot see why!
Maybe in IE whatever protection you have built in to stop the code being shown is overriding the password prompt.
Is there such a thing as stopping the source code being shown? I certainly havent implimented anyhtign and never would.. goes against the whole concept of the WWW in my opinion...
So this isn't a TSOhost issue then but more likely something with the browsers?
Dave
Another thought - could something like an Adblocker be stopping the password dialogue from loading?
This could happen if it loads from another (third party) site?
I get this on IE11 and more or less the same on Edge in W10