Chris J Dixon wrote:

I know there are a lot of folk around here who are deeper into
these matters than me, so I'm looking for a way forward. If the
error messages were a bit more helpful, I might know where to
look.

I have a problem with Nottingham Playhouse login which is
puzzling me, and although it may be caused by something they have
changed, it looks like resolution is down to me. I would welcome
any advice.

If, using my desktop, on
https://nottinghamplayhouse.co.uk/my-account/ I click on
the silhouette to log in, the popup in Firefox reads "Firefox
can't open this page.

As I tried earlier in the week, it still works for me
firefox 64bit
windows 10
plusnet
cloudflare quad1 DNS servers
all 3rd party cookies blocked, other cookies allowed but discarded daily
"uBlock origin" and "I don't care about cookies" add-ons installed

Other browsers just show an icon and
"tickets.nottinghamplayhouse.co.uk refused to connect."

Using https://www.whatismybrowser.com/

"Your web browser is:
Firefox 87 on Windows 10
Your web browser is up to date

Your Web Browser's Settings:

Is JavaScript enabled?
Yes - JavaScript is enabled

Are Cookies enabled?
Yes - Cookies are enabled

Are Third-Party Cookies enabled?
Yes - Third-Party Cookies are enabled"

Our laptops behave the same.

can you try a laptop that fails, either on a VPN (free trial?) or on a
MiFi (or neighbour's wifi)? Does it still fail

delete all cookies and force refresh with ctrl-F5

turn on browser console in firefox under developer tools, do you see any
errors.

try turning off firefox enhanced tracking protection for the site under
the shield icon in the URL bar.

My Android tablet using Firefox shows:

"Blocked by X-Frame-Options Policy
This page has an X-Frame-Options Policy that prevents it being
loaded in this context"

Our mobiles behave the same on wi-fi.

However, my partner's work laptop using a VPN works OK, as does
her mobile using data.

I can't find any settings in browser, Virgin Media, Kaspersky or
Router that suggest they might be involved.


tun off virgin DNS hi-jacking at
https://my.virginmedia.com/advancederrorsearch

or use a DNS server other than Virgin's

Initially, Playhouse said:

"... the issue may be due to strict security settings on your
devices that block cross-domain traffic - put simply, our booking
page has two domains. One for our website itself and one for our
ticketing system.

but their ticketing site is a sub-domain of their main domain, so that
shouldn't be blocked, if it was a totally unrelated domain, it would
need work (by them) to allow one domain permission to do CORS between them.


I have turned off Enhanced Tracking Protection for the Playhouse
site, but it doesn't help.

ok, scratch that then

The Virgin Media box is in modem mode feeding a Netgear Nighthawk
R7000.

I'm really not sure now where to look to address the issue.

Chris