diff --git a/src/lib/adapters/openshell/client.test.ts b/src/lib/adapters/openshell/client.test.ts
index 37fec1735ac..29b0f829900 100644
--- a/src/lib/adapters/openshell/client.test.ts
+++ b/src/lib/adapters/openshell/client.test.ts
@@ -291,6 +291,31 @@ describe("openshell helpers", () => {
     ]);
   });
 
+  it("scopes both sandbox lookups to the requested gateway (#7429)", () => {
+    const calls: string[][] = [];
+    const spawnSyncImpl: OpenshellSpawnSync = (_command, args) => {
+      calls.push([...args]);
+      return makeSpawnResult({
+        status: 0,
+        stdout: args.includes("get") ? "alpha Ready\n" : "Host openshell-alpha\n",
+        stderr: "",
+      });
+    };
+
+    captureSandboxSshConfigCommand("openshell", "alpha", {
+      spawnSyncImpl,
+      gatewayName: "nemoclaw-18080",
+    });
+
+    // Both hops must carry the gateway: `get` succeeding on one gateway while
+    // `ssh-config` resolves against another would emit a config for the wrong
+    // sandbox.
+    expect(calls).toEqual([
+      ["sandbox", "get", "-g", "nemoclaw-18080", "alpha"],
+      ["sandbox", "ssh-config", "-g", "nemoclaw-18080", "alpha"],
+    ]);
+  });
+
   it("does not request SSH config when the sandbox is missing", () => {
     const calls: string[][] = [];
     const spawnSyncImpl: OpenshellSpawnSync = (_command, args) => {
diff --git a/src/lib/adapters/openshell/client.ts b/src/lib/adapters/openshell/client.ts
index 031e193992a..c635911433f 100644
--- a/src/lib/adapters/openshell/client.ts
+++ b/src/lib/adapters/openshell/client.ts
@@ -57,6 +57,18 @@ export interface CaptureOpenshellAsyncOptions extends CaptureOpenshellOptions {
   spawnImpl?: OpenshellSpawn;
 }
 
+export interface CaptureSandboxSshConfigOptions extends CaptureOpenshellOptions {
+  /**
+   * Gateway the sandbox is recorded against (`resolveSandboxGatewayName`).
+   * `sandbox get` and `sandbox ssh-config` resolve against OpenShell's mutable
+   * current selection when no gateway is given, so a caller that knows the
+   * sandbox's own binding must pass it — otherwise the lookup can land on a
+   * sibling gateway and report the sandbox as missing (#7429). Omitted keeps
+   * the ambient-selection behavior for callers that have no binding to supply.
+   */
+  gatewayName?: string;
+}
+
 export interface CaptureOpenshellResult {
   status: number | null;
   output: string;
@@ -238,16 +250,32 @@ export function captureOpenshellCommand(
   };
 }
 
+/**
+ * Insert `-g <gateway>` after the subcommand pair, matching the placement
+ * `gatewayScopedArgs` already uses in `actions/sandbox/gateway-state.ts`.
+ * Duplicated rather than imported: an adapter must not depend on the actions
+ * layer.
+ */
+function gatewayScopedArgs(args: string[], gatewayName?: string): string[] {
+  if (!gatewayName) return args;
+  return [...args.slice(0, 2), "-g", gatewayName, ...args.slice(2)];
+}
+
 export function captureSandboxSshConfigCommand(
   binary: string,
   sandboxName: string,
-  opts: CaptureOpenshellOptions = {},
+  opts: CaptureSandboxSshConfigOptions = {},
 ): CaptureOpenshellResult {
-  const sandboxGet = captureOpenshellCommand(binary, ["sandbox", "get", sandboxName], {
-    ...opts,
-    ignoreError: true,
-    includeStderr: true,
-  });
+  const { gatewayName, ...spawnOpts } = opts;
+  const sandboxGet = captureOpenshellCommand(
+    binary,
+    gatewayScopedArgs(["sandbox", "get", sandboxName], gatewayName),
+    {
+      ...spawnOpts,
+      ignoreError: true,
+      includeStderr: true,
+    },
+  );
   if (sandboxGet.status !== 0) {
     const output = sandboxGet.output || `failed to query sandbox '${sandboxName}'`;
     const sandboxMissing = /\bnot[- ]?found\b/i.test(output);
@@ -256,7 +284,13 @@ export function captureSandboxSshConfigCommand(
       output: sandboxMissing ? `sandbox '${sandboxName}' not found` : output,
     };
   }
-  return captureOpenshellCommand(binary, ["sandbox", "ssh-config", sandboxName], opts);
+  // Pin every hop to the same gateway so `get` and `ssh-config` cannot
+  // disagree about which one owns the sandbox.
+  return captureOpenshellCommand(
+    binary,
+    gatewayScopedArgs(["sandbox", "ssh-config", sandboxName], gatewayName),
+    spawnOpts,
+  );
 }
 
 export function captureOpenshellCommandAsync(
diff --git a/src/lib/sandbox/version.test.ts b/src/lib/sandbox/version.test.ts
index 3211f4b7494..d3f179b9b4f 100644
--- a/src/lib/sandbox/version.test.ts
+++ b/src/lib/sandbox/version.test.ts
@@ -162,10 +162,13 @@ describe("checkAgentVersion", () => {
     expect(result.detectionMethod).toBe("ssh-exec");
     expect(result.sandboxVersion).toBe("2026.5.27");
     expect(result.isStale).toBe(false);
+    // A row that pre-dates the per-port migration resolves to the canonical
+    // default gateway, and the probe pins to it explicitly rather than
+    // inheriting OpenShell's current selection (#7429).
     expect(captureSandboxSshConfigCommand).toHaveBeenCalledWith(
       "/usr/local/bin/openshell",
       "test-sb",
-      { ignoreError: true, timeout: OPENSHELL_PROBE_TIMEOUT_MS },
+      { ignoreError: true, timeout: OPENSHELL_PROBE_TIMEOUT_MS, gatewayName: "nemoclaw" },
     );
     const sshArgs = vi.mocked(spawnSync).mock.calls[0]?.[1] as string[];
     const configFile = sshArgs[sshArgs.indexOf("-F") + 1];
@@ -180,6 +183,103 @@ describe("checkAgentVersion", () => {
     expect(updated?.agentVersion).toBe("2026.5.27");
   });
 
+  it("probes the sandbox's own recorded gateway, not OpenShell's ambient selection (#7429)", () => {
+    // A sandbox onboarded under a non-default NEMOCLAW_GATEWAY_PORT is
+    // registered against `nemoclaw-<port>`. `openshell sandbox get` /
+    // `ssh-config` fall back to OpenShell's mutable current selection when no
+    // gateway is given, so an unscoped probe queries the wrong gateway,
+    // returns "not found", and the sandbox is reported as `v?` even though the
+    // gateway-scoped sandbox listing observed it as live.
+    registry.registerSandbox({ name: "test-sb", agent: null, gatewayPort: 18080 });
+
+    vi.mocked(captureSandboxSshConfigCommand).mockReturnValue({
+      status: 0,
+      output: "Host openshell-test-sb\n  HostName 127.0.0.1\n",
+    });
+    vi.mocked(spawnSync).mockReturnValue({
+      status: 0,
+      stdout: "OpenClaw 2026.5.27 (abc123)\n",
+      stderr: "",
+      pid: 1234,
+      output: [],
+      signal: null,
+    });
+
+    const result = checkAgentVersion("test-sb", { forceProbe: true });
+
+    expect(result.detectionMethod).toBe("ssh-exec");
+    expect(captureSandboxSshConfigCommand).toHaveBeenCalledWith(
+      "/usr/local/bin/openshell",
+      "test-sb",
+      {
+        ignoreError: true,
+        timeout: OPENSHELL_PROBE_TIMEOUT_MS,
+        gatewayName: "nemoclaw-18080",
+      },
+    );
+  });
+
+  it("scopes a Hermes sandbox on a non-default gateway to its own gateway (#7429)", () => {
+    // The exact reported topology: a Hermes sandbox onboarded under a
+    // non-default NEMOCLAW_GATEWAY_PORT. Before the fix the probe queried
+    // OpenShell's ambient selection, came back "not found", and
+    // `upgrade-sandboxes --check` printed `v? → v0.18.0`.
+    registry.registerSandbox({ name: "hermes-sb", agent: "hermes", gatewayPort: 18080 });
+
+    vi.mocked(captureSandboxSshConfigCommand).mockReturnValue({
+      status: 0,
+      output: "Host openshell-hermes-sb\n  HostName 127.0.0.1\n",
+    });
+    vi.mocked(spawnSync).mockReturnValue({
+      status: 0,
+      stdout: "Hermes Agent 0.17.0\n",
+      stderr: "",
+      pid: 1234,
+      output: [],
+      signal: null,
+    });
+
+    const result = checkAgentVersion("hermes-sb", { forceProbe: true });
+
+    expect(captureSandboxSshConfigCommand).toHaveBeenCalledWith(
+      "/usr/local/bin/openshell",
+      "hermes-sb",
+      {
+        ignoreError: true,
+        timeout: OPENSHELL_PROBE_TIMEOUT_MS,
+        gatewayName: "nemoclaw-18080",
+      },
+    );
+    // The version resolves instead of landing in the "Unknown version" bucket.
+    expect(result.detectionMethod).toBe("ssh-exec");
+    expect(result.sandboxVersion).toBe("0.17.0");
+    expect(result.verificationFailed).toBe(false);
+    // The Hermes agent definition drives the probe, not the openclaw default.
+    const sshArgs = vi.mocked(spawnSync).mock.calls[0]?.[1] as string[];
+    expect(sshArgs).toContain("hermes --version");
+  });
+
+  it("does not probe at all when the persisted gateway binding is corrupted (#7429)", () => {
+    // resolveSandboxGatewayName fails closed on an invalid binding. Falling
+    // back to an unscoped probe would defeat that: OpenShell would resolve the
+    // name against its ambient selection, so a same-named sandbox on another
+    // gateway could be probed and its version cached onto this row. A row with
+    // no binding fields resolves to the canonical default instead of throwing,
+    // so this path is reached only by genuinely corrupted state.
+    registry.registerSandbox({ name: "test-sb", agent: null, gatewayName: "not-a-nemoclaw-gw" });
+
+    const result = checkAgentVersion("test-sb", { forceProbe: true });
+
+    expect(captureSandboxSshConfigCommand).not.toHaveBeenCalled();
+    expect(spawnSync).not.toHaveBeenCalled();
+    // No probe was attempted, so the contract's `unavailable` applies —
+    // `unknown`/`probe-failed` would claim a probe ran and failed.
+    expect(result.detectionMethod).toBe("unavailable");
+    expect(result.unavailableReason).toBe("invalid-gateway-binding");
+    expect(result.verificationFailed).toBe(true);
+    expect(result.sandboxVersion).toBeNull();
+  });
+
   it("returns an unknown verdict when SSH config fails so callers do not read isStale as verified current", () => {
     registry.registerSandbox({ name: "test-sb", agent: null });
 
diff --git a/src/lib/sandbox/version.ts b/src/lib/sandbox/version.ts
index 59e535c6229..7fcfe6a004e 100644
--- a/src/lib/sandbox/version.ts
+++ b/src/lib/sandbox/version.ts
@@ -17,6 +17,7 @@ import {
 import { resolveOpenshell } from "../adapters/openshell/resolve.js";
 import { OPENSHELL_PROBE_TIMEOUT_MS } from "../adapters/openshell/timeouts.js";
 import { loadAgent } from "../agent/defs.js";
+import { resolveSandboxGatewayName } from "../onboard/gateway-binding.js";
 import * as registry from "../state/registry.js";
 import { createTempSshConfig } from "./temp-ssh-config.js";
 import { evaluateStaleness } from "./version-scheme.js";
@@ -58,7 +59,11 @@ export interface VersionCheckResult {
    */
   schemeMismatch?: boolean;
   /** Categorises why the result could not be computed, so callers can surface a distinct state. */
-  unavailableReason?: "no-expected-version" | "skip-probe" | "probe-failed";
+  unavailableReason?:
+    | "no-expected-version"
+    | "skip-probe"
+    | "probe-failed"
+    | "invalid-gateway-binding";
 }
 
 /**
@@ -79,19 +84,48 @@ function resolveAgentForSandbox(sandboxName: string): ReturnType<typeof loadAgen
   return loadAgent(agentName);
 }
 
+/**
+ * Gateway to scope the probe to, or null when the persisted binding was
+ * rejected. An entry with no binding fields resolves to the canonical default
+ * gateway, so null here means the row is corrupted — never that scoping is
+ * unnecessary.
+ */
+function resolveProbeGatewayName(sandboxName: string): string | null {
+  try {
+    return resolveSandboxGatewayName(registry.getSandbox(sandboxName));
+  } catch {
+    return null;
+  }
+}
+
 /**
  * Probe the live agent version inside a sandbox via SSH.
  * Returns the parsed version string or null on failure.
  */
-export function probeAgentVersion(sandboxName: string): string | null {
+export function probeAgentVersion(sandboxName: string, gatewayName?: string): string | null {
   const agent = resolveAgentForSandbox(sandboxName);
 
+  // Scope the lookup to the sandbox's own gateway. Without it OpenShell
+  // resolves `sandbox get`/`ssh-config` against its mutable current selection,
+  // so a sandbox bound to a sibling gateway is reported missing and its
+  // version renders as `v?` (#7429).
+  //
+  // Resolved before the binary lookup: a rejected binding must not fall back to
+  // the ambient gateway (the case `resolveSandboxGatewayName` fails closed on,
+  // because a same-named sandbox on another gateway would be probed and its
+  // version cached onto this row), and there is no reason to shell out to
+  // `command -v openshell` only to discard the result. A caller that already
+  // resolved the binding passes it in rather than re-reading the registry.
+  const probeGatewayName = gatewayName ?? resolveProbeGatewayName(sandboxName);
+  if (probeGatewayName === null) return null;
+
   const openshellBinary = resolveOpenshell();
   if (!openshellBinary) return null;
 
   const sshConfigResult = captureSandboxSshConfigCommand(openshellBinary, sandboxName, {
     ignoreError: true,
     timeout: OPENSHELL_PROBE_TIMEOUT_MS,
+    gatewayName: probeGatewayName,
   });
   if (sshConfigResult.status !== 0) return null;
   if (!sshConfigResult.output.trim()) return null;
@@ -186,8 +220,24 @@ export function checkAgentVersion(
     };
   }
 
+  // A rejected gateway binding means no probe is attempted at all, which the
+  // result contract distinguishes from a probe that ran and failed: report
+  // `unavailable` rather than `unknown`/`probe-failed` so an operator can tell
+  // a corrupted registry row from an unreachable sandbox.
+  const probeGatewayName = resolveProbeGatewayName(sandboxName);
+  if (probeGatewayName === null) {
+    return {
+      sandboxVersion: null,
+      expectedVersion,
+      isStale: false,
+      verificationFailed: true,
+      detectionMethod: "unavailable",
+      unavailableReason: "invalid-gateway-binding",
+    };
+  }
+
   // Slow path: SSH exec into sandbox
-  const probed = probeAgentVersion(sandboxName);
+  const probed = probeAgentVersion(sandboxName, probeGatewayName);
   if (probed && sb) {
     // Cache for future fast-path lookups
     registry.updateSandbox(sandboxName, { agentVersion: probed });
diff --git a/test/cli/connect-readiness.test.ts b/test/cli/connect-readiness.test.ts
index 27c981f9513..e977a475c34 100644
--- a/test/cli/connect-readiness.test.ts
+++ b/test/cli/connect-readiness.test.ts
@@ -46,7 +46,7 @@ describe("CLI connect readiness", () => {
         `marker_file=${JSON.stringify(markerFile)}`,
         `state_file=${JSON.stringify(stateFile)}`,
         'printf \'%s\\n\' "$*" >> "$marker_file"',
-        'if [ "$1" = "sandbox" ] && [ "$2" = "get" ] && [ "$3" = "alpha" ]; then',
+        'if [ "$1" = "sandbox" ] && [ "$2" = "get" ] && [ "$3" = "-g" ] && [ "$4" = "nemoclaw" ] && [ "$5" = "alpha" ]; then',
         "  echo 'Sandbox:'",
         "  echo",
         "  echo '  Id: abc'",
@@ -97,7 +97,7 @@ describe("CLI connect readiness", () => {
     expect(r.out.includes("Waiting for sandbox 'alpha' to be ready")).toBeTruthy();
     expect(r.out.includes("Sandbox is ready. Connecting")).toBeTruthy();
     const calls = fs.readFileSync(markerFile, "utf8").trim().split("\n").filter(Boolean);
-    expect(calls).toContain("sandbox get alpha");
+    expect(calls).toContain("sandbox get -g nemoclaw alpha");
     expect(
       calls.filter((call) => call === "sandbox list -g nemoclaw").length,
     ).toBeGreaterThanOrEqual(2);
@@ -136,7 +136,7 @@ describe("CLI connect readiness", () => {
           "#!/usr/bin/env bash",
           `marker_file=${JSON.stringify(markerFile)}`,
           'printf \'%s\\n\' "$*" >> "$marker_file"',
-          'if [ "$1" = "sandbox" ] && [ "$2" = "get" ] && [ "$3" = "alpha" ]; then',
+          'if [ "$1" = "sandbox" ] && [ "$2" = "get" ] && [ "$3" = "-g" ] && [ "$4" = "nemoclaw" ] && [ "$5" = "alpha" ]; then',
           "  echo 'Sandbox:'",
           "  echo",
           "  echo '  Id: abc'",
@@ -221,7 +221,7 @@ describe("CLI connect readiness", () => {
         "#!/usr/bin/env bash",
         `marker_file=${JSON.stringify(markerFile)}`,
         'printf \'%s\\n\' "$*" >> "$marker_file"',
-        'if [ "$1" = "sandbox" ] && [ "$2" = "get" ] && [ "$3" = "alpha" ]; then',
+        'if [ "$1" = "sandbox" ] && [ "$2" = "get" ] && [ "$3" = "-g" ] && [ "$4" = "nemoclaw" ] && [ "$5" = "alpha" ]; then',
         "  echo 'Sandbox:'",
         "  echo",
         "  echo '  Id: abc'",
@@ -253,7 +253,7 @@ describe("CLI connect readiness", () => {
     expect(r.out.includes("nemoclaw alpha logs --follow")).toBeTruthy();
     expect(r.out.includes("nemoclaw alpha status")).toBeTruthy();
     const calls = fs.readFileSync(markerFile, "utf8").trim().split("\n").filter(Boolean);
-    expect(calls).toContain("sandbox get alpha");
+    expect(calls).toContain("sandbox get -g nemoclaw alpha");
     expect(calls).toContain("sandbox list -g nemoclaw");
     expect(calls).not.toContain("should-not-connect");
   });
diff --git a/test/cli/connect-recovery.test.ts b/test/cli/connect-recovery.test.ts
index 09094c2c390..dfa06e7f176 100644
--- a/test/cli/connect-recovery.test.ts
+++ b/test/cli/connect-recovery.test.ts
@@ -479,7 +479,7 @@ describe("CLI connect recovery process contracts", () => {
     expect(result.code).toBe(0);
     const calls = fs.readFileSync(markerFile, "utf8");
     expect(calls).toContain("sandbox list");
-    expect(calls).toContain("sandbox get alpha");
+    expect(calls).toContain("sandbox get -g nemoclaw alpha");
     expect(calls).toContain("sandbox connect alpha");
     const recoveredRegistry = JSON.parse(
       fs.readFileSync(path.join(nemoclawDir, "sandboxes.json"), "utf8"),
diff --git a/test/cli/list-share-live-inference.test.ts b/test/cli/list-share-live-inference.test.ts
index 7ddac87d89a..843d6a0ad4b 100644
--- a/test/cli/list-share-live-inference.test.ts
+++ b/test/cli/list-share-live-inference.test.ts
@@ -253,11 +253,11 @@ describe("list shows live gateway inference", () => {
           '  echo "my-agent   Running   openclaw"',
           "  exit 0",
           "fi",
-          'if [ "$1" = "sandbox" ] && [ "$2" = "get" ] && [ "$3" = "my-agent" ]; then',
+          'if [ "$1" = "sandbox" ] && [ "$2" = "get" ] && [ "$3" = "-g" ] && [ "$4" = "nemoclaw" ] && [ "$5" = "my-agent" ]; then',
           "  echo 'Sandbox: my-agent'",
           "  exit 0",
           "fi",
-          'if [ "$1" = "sandbox" ] && [ "$2" = "ssh-config" ] && [ "$3" = "my-agent" ]; then',
+          'if [ "$1" = "sandbox" ] && [ "$2" = "ssh-config" ] && [ "$3" = "-g" ] && [ "$4" = "nemoclaw" ] && [ "$5" = "my-agent" ]; then',
           "  echo 'Host openshell-my-agent'",
           "  echo '  HostName 127.0.0.1'",
           "  exit 0",
@@ -327,11 +327,11 @@ describe("list shows live gateway inference", () => {
           '  echo "my-agent   Running   openclaw"',
           "  exit 0",
           "fi",
-          'if [ "$1" = "sandbox" ] && [ "$2" = "get" ] && [ "$3" = "my-agent" ]; then',
+          'if [ "$1" = "sandbox" ] && [ "$2" = "get" ] && [ "$3" = "-g" ] && [ "$4" = "nemoclaw" ] && [ "$5" = "my-agent" ]; then',
           "  echo 'Sandbox: my-agent'",
           "  exit 0",
           "fi",
-          'if [ "$1" = "sandbox" ] && [ "$2" = "ssh-config" ] && [ "$3" = "my-agent" ]; then',
+          'if [ "$1" = "sandbox" ] && [ "$2" = "ssh-config" ] && [ "$3" = "-g" ] && [ "$4" = "nemoclaw" ] && [ "$5" = "my-agent" ]; then',
           "  echo 'Host openshell-my-agent'",
           "  echo '  HostName 127.0.0.1'",
           "  exit 0",
@@ -405,7 +405,7 @@ describe("list shows live gateway inference", () => {
           '  echo "my-agent   Running   openclaw"',
           "  exit 0",
           "fi",
-          'if [ "$1" = "sandbox" ] && [ "$2" = "ssh-config" ] && [ "$3" = "my-agent" ]; then',
+          'if [ "$1" = "sandbox" ] && [ "$2" = "ssh-config" ] && [ "$3" = "-g" ] && [ "$4" = "nemoclaw" ] && [ "$5" = "my-agent" ]; then',
           "  echo 'Host openshell-my-agent'",
           "  echo '  HostName 127.0.0.1'",
           "  exit 0",
@@ -478,11 +478,11 @@ describe("list shows live gateway inference", () => {
           '  echo "my-agent   Running   openclaw"',
           "  exit 0",
           "fi",
-          'if [ "$1" = "sandbox" ] && [ "$2" = "get" ] && [ "$3" = "my-agent" ]; then',
+          'if [ "$1" = "sandbox" ] && [ "$2" = "get" ] && [ "$3" = "-g" ] && [ "$4" = "nemoclaw" ] && [ "$5" = "my-agent" ]; then',
           "  echo 'Sandbox: my-agent'",
           "  exit 0",
           "fi",
-          'if [ "$1" = "sandbox" ] && [ "$2" = "ssh-config" ] && [ "$3" = "my-agent" ]; then',
+          'if [ "$1" = "sandbox" ] && [ "$2" = "ssh-config" ] && [ "$3" = "-g" ] && [ "$4" = "nemoclaw" ] && [ "$5" = "my-agent" ]; then',
           "  echo 'Host openshell-my-agent'",
           "  echo '  HostName 127.0.0.1'",
           "  exit 0",