Fb Crawler can't put the page in what may be the reason?

The problem is fb crawler cannot scrapit the page url. The 404 error. This can be seen when adding a url in a post and when posting the page in fb instant articles.
In the debugger https://developers.facebook.com/tools/debug/sharing/ if first time to score the link 404 error, second time loads without pictures, third time it loads all the picture including.
Wordpress website on the basis of nginx.

Access.log any 404 errors for facebookexternalhit not issue.
In the nginx config before was below, but now I have it just in case removed, facebookexternalhit the idea of anything not a block.
if ($http_user_agent ~* msnbot|scrapbot) {
 return 403;

All opengraph tags are exhibited YOAST. Plugin deactivated activated, to no avail.

Partially managed to solve the problem of a crutch in the footer of the page added
<iframe style="width: 0px; height: 0px; margin: 0px; padding: 0px;" src="https://www.facebook.com/sharer/sharer.php?u=http%3A%2F%2Fwww.mysite.com"></iframe>

When you insert links in a post on FB everything works instantly, in the Instant Articles are still a problem (can't put the old viewed content everywhere "page not found").

By the way, the problem began when I upgraded droplet on digitalocean for a more powerful.
Those who faced, enlighten me, what's the catch then?
July 2nd 19 at 18:52
0 answer

Find more questions by tags CrawlingFacebookNginx