Chris J Dixon wrote:

I'm not really sure what you are asking there.

All I was saying is that using a browser, cloudflade doesn't block my IP
address, but if I use a command line tool to retrieve the same page, I
get the same 1020 error you did, so there are "other factors" that
cloudflare objects to, as well as IP addr.

One factor might be the UserAgent, so I was asking if you might have
installed a browser add-on to modify your UserAgent string?

I'm pretty sure that it is actually my IP address that Cloudflare
doesn't like. Browsing via Opera's VPN works with no issues.

My conclusion so far is that the X- thing is a red herring

It is, because the X- header definitely doesn't exist on the proper
Spektrix server, only the cloudflare server.

and only triggered by Cloudflare trying to tell me it doesn't like
my IP, but being paradoxically blocked from doing so by Playhouse
website security settings.
Yep, that's about the level of it.