diff --git a/tachyon/files/usr/lib/service/event_controller.uc b/tachyon/files/usr/lib/service/event_controller.uc
index 125cc47e..c09fd0b9 100644
--- a/tachyon/files/usr/lib/service/event_controller.uc
+++ b/tachyon/files/usr/lib/service/event_controller.uc
@@ -235,7 +235,9 @@ function proxy_port() {
     if (cached_proxy_port !== null)
         return as_string(cached_proxy_port);
 
-    let port = "4534";
+    // Empty when the generated config has no http/mixed inbound: probing the
+    // default port would measure a dead listener and report the proxy broken.
+    let port = "";
     let sb_cfg = parse_singbox_config();
     if (sb_cfg && sb_cfg.inbounds) {
         for (let inb in sb_cfg.inbounds) {
@@ -508,6 +510,9 @@ function controller(bus, opts) {
         if (pid == "" || !process_running(pid, "sing-box")) return;
 
         let port = proxy_port();
+        // No http/mixed inbound in the generated config: there is nothing to
+        // measure, so the proxy must not be declared broken on a dead port.
+        if (port == "") return;
         let check_url = setting("ai_proxy_health_url", "https://cp.cloudflare.com/generate_204");
 
         let started = time();
diff --git a/tachyon/files/usr/lib/service/watchdog.uc b/tachyon/files/usr/lib/service/watchdog.uc
index 2260dd9f..20a4b2f2 100644
--- a/tachyon/files/usr/lib/service/watchdog.uc
+++ b/tachyon/files/usr/lib/service/watchdog.uc
@@ -1313,6 +1313,8 @@ function smart_detect_process_pending() {
     // Reuse the controller's cached port value: re-parsing config.json here
     // would duplicate the work event_controller already does (and caches).
     let proxy_addr = "127.0.0.1:" + controller.proxy_port();
+    // No http/mixed inbound in the generated config: probing is pointless.
+    if (proxy_addr == "127.0.0.1:") return;
 
     let detect_sections = [];
     let raw_list = cfg.smart_detect_sections;
diff --git a/tests/heal_suppression.sh b/tests/heal_suppression.sh
index 77a80d64..b2218020 100644
--- a/tests/heal_suppression.sh
+++ b/tests/heal_suppression.sh
@@ -105,6 +105,19 @@ echo "$wan_heal_body" | grep -q 'if (settings().recovery_bypass == "1") return;'
 echo "$wan_heal_body" | grep -q '/sbin/ubus call network.interface.wan renew' \
   || fail "heal_wan_and_gateway no longer tries a graceful renew before ifdown/ifup"
 
+# ── no http/mixed inbound → the proxy probe must not declare it broken ───────
+# proxy_port() used to fall back to the hardcoded 4534, so a config without
+# any http/mixed inbound (economy mode, all mixed proxies off) measured a dead
+# listener and the watchdog restarted sing-box every ~minute (issue #31).
+proxy_port_body="$(sed -n '/^function proxy_port()/,/^}$/p' "$CONTROLLER_UC")"
+echo "$proxy_port_body" | grep -q 'let port = "";' \
+  || fail "proxy_port() still defaults to a fake port instead of signalling 'no proxy inbound'"
+proxy_probe_body="$(sed -n '/function probe_proxy()/,/^    }$/p' "$CONTROLLER_UC")"
+echo "$proxy_probe_body" | grep -q 'if (port == "") return;' \
+  || fail "probe_proxy() probes a dead default port when the config has no http/mixed inbound"
+grep -q 'if (proxy_addr == "127.0.0.1:") return;' "$WATCHDOG_UC" \
+  || fail "smart-detect probes the empty proxy address when the config has no http/mixed inbound"
+
 # ── the consequences actually check ───────────────────────────────────────────
 for healer in heal_dns_stall heal_proxy_connectivity heal_proxy_health heal_dns_continuous; do
   grep -q "suppressed_by_root_cause(\"$healer\")" "$WATCHDOG_UC" \