In new Version - When Syncing it shows!

[sumonbd8067]

[dan678]

See if this FAQ helps:

Anki os error 10060

Updating to a more recent Anki version will prevent the popup from appearing, but the underlying issue is likely something on your machine filtering Anki’s internet connection. https://faqs.ankiweb.net/error-establishing-a-secure-connection-when-syncing.html