perpetual “scan stage failed” plus cURL error 7

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Manual scans have failed for the past 6+ months. I’ve searched the forums and the solutions I found haven’t worked.

I’ve tried all the troubleshooting steps listed here.
I’ve tried clicking “Use only IPv4 to start scans.”
I’ve tried increasing memory.

I’ve chatted to my host, SiteGround, and they cannot see any reason for the fail.

In Tools > Diagnostics > Connectivity there’s an alert that says wp_remote_post() test back to this server failed! Response was: cURL error 7, but one of the support forums said it may not be important.