Issue Isssues with Varnish Docker and Magento

[KooTjoo]

Hi all,

Hope someone can help me here. I am trying to get Varnish Docker to work with my Magento 2 Installation. I have a multistore setup in Magento with different .tld's pointing to 1 site. If I setup the default VCL like this:

backend default {
.host = "www.mydomain.com";
.port = "7080";
.first_byte_timeout = 600s;
.probe = {
.url = "/pub/health_check.php";
.timeout = 2s;
.interval = 5s;
.window = 10;
.threshold = 5;
}
}

Everything works like it should. I get a Varnish Hit on my pages for this domain. My issue is that I want to use the IP for the .host setting since I have different .tld's If I use this

backend default {
.host = "155.144.214.155";
.port = "7080";
.first_byte_timeout = 600s;
.probe = {
.url = "/pub/health_check.php";
.timeout = 2s;
.interval = 5s;
.window = 10;
.threshold = 5;
}
}

I get a backend fetch failed error. I have a server with multiple IP's I have tried IP from server itself and the IP of the subscription.

I hope anyone can share some light on this and point me in the right direction.

Thanks!