Landing Page Plugin Not Working

Hi, is anyone else having problems with landing pages and Twitter?

I am trying to use Twitter ads to direct clicks to my landing page. The click stats from twitter match the view stats on the Wordpress “Infusionsoft Landing Pages” plugin settings page, so the clicks from Twitter are getting there.

However, I am getting no new sign ups - also I am getting the folllowing error message in my error log:
[28-May-2018 14:26:01 UTC] cURL error 7: Failed to connect to [28-May-2018 14:26:01 UTC] cURL error 7: Failed to connect to kv424-14a59c.pages.infusionsoft.net port 443: Connection refused

So there seems to be some plugin/hosted landing page API connectivity issue?

If I go to the link directly and fill in the form, the contact is added and flows through my campaign as expected.

Any help would be appreciated!

Thanks
Stephanie