If you encounter a timeout status while optimizing/caching your pages, or if your pages are not reachable from our servers, it’s advisable to verify whether a security plugin or a firewall set up by you, your hosting service, or your CDN provider is blocking our servers’ access to your pages. If that’s the situation, kindly add our IP addresses to the whitelist:
23.88.6.90
136.243.103.55
176.9.77.187
5.161.48.189