The library’s PC was blocked from a Cloudflare site. This was not the CAPTCHA style block but a hard and fast absolute block. I tested another site which I know is Cloudflared, and no block (but that was the type of site that pushes CAPTCHAs rather than absolute blocks).

So I’m wondering how common this is. Cloudflare is generally hostile toward any shared IP address. Are many libraries experiencing Cloudfare blockades?