--- a/util/prosodyctl/check.lua	Sun Jul 04 01:23:35 2021 +0200
+++ b/util/prosodyctl/check.lua	Sun Jul 04 01:29:47 2021 +0200
@@ -473,6 +473,12 @@
 
 			local use_ipv4 = configmanager.get("*", "use_ipv4") ~= false;
 			local use_ipv6 = configmanager.get("*", "use_ipv6") ~= false;
+			if not use_ipv4 and not use_ipv6 then
+				print("    Both IPv6 and IPv4 are disabled, Prosody will not listen on any ports");
+				print("    nor be able to connect to any remote servers.");
+				all_targets_ok = false;
+			end
+
 			for target_host in target_hosts do
 				local host_ok_v4, host_ok_v6;
 				do