Error from the instant indexing plugin

Failed to connect to Google OAuth, Cloudflare firewall blocked this connection.

The error message you can see here:

cURL error 7: Failed to connect to oauth2.googleapis.com port 443: Connection refused (see libcurl - Error Codes)

I don’t see any indication of that. Cloudflare’s firewall is only for inbound connections. That looks like an outbound connection.

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