--- a/plugins/mod_register_ibr.lua	Sun Sep 29 15:51:21 2019 +0200
+++ b/plugins/mod_register_ibr.lua	Sun Sep 29 15:26:18 2019 +0200
@@ -168,7 +168,7 @@
 	module:fire_event("user-registering", user);
 	if not user.allowed then
 		log("debug", "Registration disallowed by module: %s", user.reason or "no reason given");
-		session.send(st.error_reply(stanza, "modify", "not-acceptable", user.reason));
+		session.send(st.error_reply(stanza, user.error_type or "modify", user.error_condition or "not-acceptable", user.reason));
 		return true;
 	end
 

--- a/plugins/mod_register_limits.lua	Sun Sep 29 15:51:21 2019 +0200
+++ b/plugins/mod_register_limits.lua	Sun Sep 29 15:26:18 2019 +0200
@@ -64,15 +64,21 @@
 		log("debug", "Registration disallowed by blacklist");
 		event.allowed = false;
 		event.reason = "Your IP address is blacklisted";
+		event.error_type = "auth";
+		event.error_condition = "forbidden";
 	elseif (whitelist_only and not ip_in_set(whitelisted_ips, ip)) then
 		log("debug", "Registration disallowed by whitelist");
 		event.allowed = false;
 		event.reason = "Your IP address is not whitelisted";
+		event.error_type = "auth";
+		event.error_condition = "forbidden";
 	elseif throttle_max and not ip_in_set(whitelisted_ips, ip) then
 		if not check_throttle(ip) then
 			log("debug", "Registrations over limit for ip %s", ip or "?");
 			event.allowed = false;
 			event.reason = "Too many registrations from this IP address recently";
+			event.error_type = "wait";
+			event.error_condition = "policy-violation";
 		end
 	end
 end);