diff --git a/controllers/preview_controller/acl/acl.go b/controllers/preview_controller/acl/acl.go
index 80e91f91a457c559498a9eb1a9e5772183084532..aa53f5ac385f8e8c3307c44447c39ae165c66f2c 100644
--- a/controllers/preview_controller/acl/acl.go
+++ b/controllers/preview_controller/acl/acl.go
@@ -21,6 +21,7 @@ func GetSafeAddress(addr string, ctx rcontext.RequestContext) (net.IP, string, e
 	if realHost != "localhost" {
 		addrs, err := net.LookupIP(realHost)
 		if err != nil {
+			ctx.Log.Warn("Error looking up DNS record for preview - assuming invalid host:", err)
 			return nil, "", common.ErrInvalidHost
 		}
 		if len(addrs) == 0 {