I'm sort of guessing here, but it sounds to me that you are talking about Mobile phone operators. not actual broadband providers ?

In reply to a post by jpm:

They shouldn't know what sites you're accessing if it's HTTPS,...

yes, it is HTTPS and site loads fine, it is only when I try to download the transfer file that I get this message.
First time it ever happened (and I am using them a lot)

In reply to a post by kitfit1:

...sounds to me that you are talking about Mobile phone operators. not actual broadband providers ?

no, they are broadband providers for rural location (wi-fi)

Just a sanity check,
using 4G hotspot and my tablet I was able to download the file with no drame...

AIRBAND sucks

and one more thing...
I wondered what this "Whalebone" thing is:

https://www.whalebone.io/

to quote from the blurb:
"...Whalebone is a cybersecurity company developing zero-disruption products for Telcos, ISPs, and enterprises..."

In reply to a post by jpm:

They shouldn't know what sites you're accessing if it's HTTPS, maybe they can if you're using the ISP DNS servers or they are intercepting DNS traffic somewhere. Look at DNS over HTTPS.

I don't think you will find that is correct. Wikipedia states

HTTPS encrypts all message contents, including the HTTP headers and the request/response data. With the exception of the possible CCA cryptographic attack described in the limitations section below, an attacker should at most be able to discover that a connection is taking place between two parties, along with their domain names and IP addresses.

My bold but it needs this information to route the packet so whilst you won't be able to see the contents of a packet you will know the destination without having to do any specific deep packet inspection - just the fact it is going through their routers they will know the domain it is destined for.

In reply to a post by bambuko:

What do you think?

Bin them off. None of their business what you do unless it's a legal requirement to deny you access.

Not a police state, an ISP that seems to think they're either a business dealing with employees where they, rightly, control what the employees do with their network or a school where student Internet access needs controlling.

Would have thought a small ISP would have better things to do than snoop on customers and send them letters but apparently not.

In reply to a post by XGS_Is_On:

In reply to a post by bambuko:

What do you think?

Bin them off. None of their business what you do unless it's a legal requirement to deny you access...

Thanks,
exactly my sentiment... but in the wilds of Devon there are few alternatives available
and those that are, are unlikely to be any better.

In my book it is bigger than one single ISP
How many of them are using similar https://www.whalebone.io/ service?

In reply to a post by ian72:

... just the fact it is going through their routers they will know the domain it is destined for.

that's my understanding as well
but... what are the options to keep them out of my business???

(and I am using them a lot)

There might be your problem... heavy user? have you read their fair use policy?

https://www.airband.co.uk/wp-content/uploads/2016/02...