net::ERR_CERT_COMMON_NAME_INVALID

[lauyeung]

I was trying to add a youtube link to the demo here but it looks like the certificate is invalid: http://linkesch.com/medium-editor-insert-plugin/

[boussou]

no, I think it is because this plugin uses https://iframely.com and now this service is no longer free.

[boussou]

I added a bug report linked to yours here: #497

For your own problem described here in this issue, you would use the http instead of https address - you can set this using oembedProxy

eg

oembedProxy: 'http://medium.iframe.ly/api/oembed?iframe=1',