diff --git a/CHANGELOG.md b/CHANGELOG.md
index d3648b85171..db371508f02 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ Docs: https://docs.openclaw.ai
 - Agents/Anthropic: preserve latest assistant thinking and redacted-thinking block ordering during transcript image sanitization so follow-up turns do not trip Anthropic's unmodified-thinking validation. (#52961) Thanks @vincentkoc.
 - Gateway/supervision: stop lock conflicts from crash-looping under launchd and systemd by keeping the duplicate process in a retry wait instead of exiting as a failure while another healthy gateway still owns the lock. Fixes #52922. Thanks @vincentkoc.
 - Browser/Chrome MCP: wait for existing-session browser tabs to become usable after attach instead of treating the initial Chrome MCP handshake as ready, which reduces user-profile timeouts and repeated consent churn on macOS Chrome attach flows. Fixes #52930. Thanks @vincentkoc.
+- Gateway/probe: stop successful gateway handshakes from timing out as unreachable while post-connect detail RPCs are still loading, so slow devices report a reachable RPC failure instead of a false negative dead gateway. Fixes #52927. Thanks @vincentkoc.
 
 ## 2026.3.22
 
diff --git a/src/gateway/probe.ts b/src/gateway/probe.ts
index b285c395c3d..f09ad3c997f 100644
--- a/src/gateway/probe.ts
+++ b/src/gateway/probe.ts
@@ -64,12 +64,23 @@ export async function probeGateway(opts: {
 
   return await new Promise<GatewayProbeResult>((resolve) => {
     let settled = false;
+    let timer: ReturnType<typeof setTimeout> | null = null;
+    const clearProbeTimer = () => {
+      if (timer) {
+        clearTimeout(timer);
+        timer = null;
+      }
+    };
+    const armProbeTimer = (onTimeout: () => void) => {
+      clearProbeTimer();
+      timer = setTimeout(onTimeout, clampProbeTimeoutMs(opts.timeoutMs));
+    };
     const settle = (result: Omit<GatewayProbeResult, "url">) => {
       if (settled) {
         return;
       }
       settled = true;
-      clearTimeout(timer);
+      clearProbeTimer();
       client.stop();
       resolve({ url: opts.url, ...result });
     };
@@ -105,6 +116,20 @@ export async function probeGateway(opts: {
           });
           return;
         }
+        // Once the gateway has accepted the session, a slow follow-up RPC should no longer
+        // downgrade the probe to "unreachable". Give detail fetching its own budget.
+        armProbeTimer(() => {
+          settle({
+            ok: false,
+            connectLatencyMs,
+            error: "timeout",
+            close,
+            health: null,
+            status: null,
+            presence: null,
+            configSnapshot: null,
+          });
+        });
         try {
           if (detailLevel === "presence") {
             const presence = await client.request("system-presence");
@@ -151,7 +176,7 @@ export async function probeGateway(opts: {
       },
     });
 
-    const timer = setTimeout(() => {
+    armProbeTimer(() => {
       settle({
         ok: false,
         connectLatencyMs,
@@ -162,7 +187,7 @@ export async function probeGateway(opts: {
         presence: null,
         configSnapshot: null,
       });
-    }, clampProbeTimeoutMs(opts.timeoutMs));
+    });
 
     client.start();
   });