iframe

i want to allow any website to display my site, using iframes. but I don't understand how to remove the lock they display, connection denied can someone tell me how to remove this limitation on my server use nginx, I tried to enter on the Apache & nginx Settings but the block persists, what...

Hello guys, we switched to another server. Now we have a problem. We have some sites that are embedded in other sites. All sites are on our server. On the old server this was no problem. But now, all browsers say, that they are not allowed to embed the sites? We just restored the sites and...