Resolving timed out after 10519 milliseconds

Hello,

It has beem a while since I have an error when login to my joomla v3.9.14 website using JFBConnect 8.3.1.

From the backend when I hit AutoTune - Facebook app I get : Facebook API Error: Resolving timed out after 10519 milliseconds

From the front-end when I autologin with Facebook I get : Error: 28 Resolving timed out after 10520 milliseconds
URL : /index.php?option=com_jfbconnect&task=authenticate.login&provider=facebook&return=L2ZyLw==&xxxxxxxxxxxxxxxxxxxxxe=1

However, sometime the login works for whatever raisons.

I'm on a dedicated server with DEBIAN v8.11 Linux and Plesk Onyx v17.8.1, PHP 7.3.13 with Curl enabled

I'm using Cloudflare for my DNS hosting, I have already added api.facbook.com and sourcecoast.com to the whitelist of my Firewall.

Should I increase some timeout settings somewhere ? I have been diging to find out a fix for many hours without success I'm getting deseperate.

Thanks for your help

Problem fixed !!!

in etc/resolv.conf I had to replace the not working nameserver address IP by Google public nameserver IP:
nameserver 8.8.8.8
nameserver 8.8.4.4

And now everything is working perfectly, even faster log-in than before