diff --git a/src/infra/bonjour-ciao.test.ts b/src/infra/bonjour-ciao.test.ts
index ad45974e2fc..9f0ccc6d3e4 100644
--- a/src/infra/bonjour-ciao.test.ts
+++ b/src/infra/bonjour-ciao.test.ts
@@ -1,70 +1,51 @@
-import { describe, expect, it, vi } from "vitest";
+import { describe, expect, it } from "vitest";
 
-const logDebugMock = vi.hoisted(() => vi.fn());
-const logWarnMock = vi.hoisted(() => vi.fn());
-
-vi.mock("../logger.js", () => ({
-  logDebug: (...args: unknown[]) => logDebugMock(...args),
-  logWarn: (...args: unknown[]) => logWarnMock(...args),
-}));
-
-const { ignoreCiaoUnhandledRejection } = await import("./bonjour-ciao.js");
+const { classifyCiaoUnhandledRejection, ignoreCiaoUnhandledRejection } =
+  await import("./bonjour-ciao.js");
 
 describe("bonjour-ciao", () => {
-  it("ignores and logs ciao announcement cancellation rejections", () => {
+  it("classifies ciao cancellation rejections separately from side effects", () => {
+    expect(classifyCiaoUnhandledRejection(new Error("CIAO PROBING CANCELLED"))).toEqual({
+      kind: "cancellation",
+      formatted: "CIAO PROBING CANCELLED",
+    });
+  });
+
+  it("classifies ciao interface assertions separately from side effects", () => {
+    expect(
+      classifyCiaoUnhandledRejection(
+        new Error("Reached illegal state! IPV4 address change from defined to undefined!"),
+      ),
+    ).toEqual({
+      kind: "interface-assertion",
+      formatted: "Reached illegal state! IPV4 address change from defined to undefined!",
+    });
+  });
+
+  it("suppresses ciao announcement cancellation rejections", () => {
     expect(ignoreCiaoUnhandledRejection(new Error("Ciao announcement cancelled by shutdown"))).toBe(
       true,
     );
-    expect(logDebugMock).toHaveBeenCalledWith(
-      expect.stringContaining("ignoring unhandled ciao rejection"),
-    );
-    expect(logWarnMock).not.toHaveBeenCalled();
   });
 
-  it("ignores and logs ciao probing cancellation rejections", () => {
-    logDebugMock.mockReset();
-    logWarnMock.mockReset();
-
+  it("suppresses ciao probing cancellation rejections", () => {
     expect(ignoreCiaoUnhandledRejection(new Error("CIAO PROBING CANCELLED"))).toBe(true);
-    expect(logDebugMock).toHaveBeenCalledWith(
-      expect.stringContaining("ignoring unhandled ciao rejection"),
-    );
-    expect(logWarnMock).not.toHaveBeenCalled();
   });
 
-  it("ignores lower-case string cancellation reasons too", () => {
-    logDebugMock.mockReset();
-    logWarnMock.mockReset();
-
+  it("suppresses lower-case string cancellation reasons too", () => {
     expect(ignoreCiaoUnhandledRejection("ciao announcement cancelled during cleanup")).toBe(true);
-    expect(logDebugMock).toHaveBeenCalledWith(
-      expect.stringContaining("ignoring unhandled ciao rejection"),
-    );
-    expect(logWarnMock).not.toHaveBeenCalled();
   });
 
   it("suppresses ciao interface assertion rejections as non-fatal", () => {
-    logDebugMock.mockReset();
-    logWarnMock.mockReset();
-
     const error = Object.assign(
       new Error("Reached illegal state! IPV4 address change from defined to undefined!"),
       { name: "AssertionError" },
     );
 
     expect(ignoreCiaoUnhandledRejection(error)).toBe(true);
-    expect(logWarnMock).toHaveBeenCalledWith(
-      expect.stringContaining("suppressing ciao interface assertion"),
-    );
-    expect(logDebugMock).not.toHaveBeenCalled();
   });
 
   it("keeps unrelated rejections visible", () => {
-    logDebugMock.mockReset();
-    logWarnMock.mockReset();
-
     expect(ignoreCiaoUnhandledRejection(new Error("boom"))).toBe(false);
-    expect(logDebugMock).not.toHaveBeenCalled();
-    expect(logWarnMock).not.toHaveBeenCalled();
   });
 });
diff --git a/src/infra/bonjour-ciao.ts b/src/infra/bonjour-ciao.ts
index 71feebd60bc..34ddb4b75fe 100644
--- a/src/infra/bonjour-ciao.ts
+++ b/src/infra/bonjour-ciao.ts
@@ -1,21 +1,27 @@
-import { logDebug, logWarn } from "../logger.js";
 import { formatBonjourError } from "./bonjour-errors.js";
 
 const CIAO_CANCELLATION_MESSAGE_RE = /^CIAO (?:ANNOUNCEMENT|PROBING) CANCELLED\b/u;
 const CIAO_INTERFACE_ASSERTION_MESSAGE_RE =
   /REACHED ILLEGAL STATE!?\s+IPV4 ADDRESS CHANGE FROM DEFINED TO UNDEFINED!?/u;
 
-export function ignoreCiaoUnhandledRejection(reason: unknown): boolean {
+export type CiaoUnhandledRejectionClassification =
+  | { kind: "cancellation"; formatted: string }
+  | { kind: "interface-assertion"; formatted: string };
+
+export function classifyCiaoUnhandledRejection(
+  reason: unknown,
+): CiaoUnhandledRejectionClassification | null {
   const formatted = formatBonjourError(reason);
   const message = formatted.toUpperCase();
-  if (!CIAO_CANCELLATION_MESSAGE_RE.test(message)) {
-    if (!CIAO_INTERFACE_ASSERTION_MESSAGE_RE.test(message)) {
-      return false;
-    }
-
-    logWarn(`bonjour: suppressing ciao interface assertion: ${formatted}`);
-    return true;
+  if (CIAO_CANCELLATION_MESSAGE_RE.test(message)) {
+    return { kind: "cancellation", formatted };
   }
-  logDebug(`bonjour: ignoring unhandled ciao rejection: ${formatted}`);
-  return true;
+  if (CIAO_INTERFACE_ASSERTION_MESSAGE_RE.test(message)) {
+    return { kind: "interface-assertion", formatted };
+  }
+  return null;
+}
+
+export function ignoreCiaoUnhandledRejection(reason: unknown): boolean {
+  return classifyCiaoUnhandledRejection(reason) !== null;
 }
diff --git a/src/infra/bonjour.test.ts b/src/infra/bonjour.test.ts
index b101171782b..fbb80603bb3 100644
--- a/src/infra/bonjour.test.ts
+++ b/src/infra/bonjour.test.ts
@@ -241,6 +241,39 @@ describe("gateway bonjour advertiser", () => {
     expect(order).toEqual(["shutdown", "cleanup"]);
   });
 
+  it("logs ciao handler classifications at the bonjour caller", async () => {
+    enableAdvertiserUnitMode();
+
+    const destroy = vi.fn().mockResolvedValue(undefined);
+    const advertise = vi.fn().mockResolvedValue(undefined);
+    mockCiaoService({ advertise, destroy });
+
+    const started = await startGatewayBonjourAdvertiser({
+      gatewayPort: 18789,
+      sshPort: 2222,
+    });
+
+    const handler = registerUnhandledRejectionHandler.mock.calls[0]?.[0] as
+      | ((reason: unknown) => boolean)
+      | undefined;
+    expect(handler).toBeTypeOf("function");
+
+    expect(handler?.(new Error("CIAO PROBING CANCELLED"))).toBe(true);
+    expect(logDebug).toHaveBeenCalledWith(
+      expect.stringContaining("ignoring unhandled ciao rejection"),
+    );
+
+    logDebug.mockClear();
+    expect(
+      handler?.(new Error("Reached illegal state! IPV4 address change from defined to undefined!")),
+    ).toBe(true);
+    expect(logWarn).toHaveBeenCalledWith(
+      expect.stringContaining("suppressing ciao interface assertion"),
+    );
+
+    await started.stop();
+  });
+
   it("logs advertise failures and retries via watchdog", async () => {
     enableAdvertiserUnitMode();
     vi.useFakeTimers();
diff --git a/src/infra/bonjour.ts b/src/infra/bonjour.ts
index a4a21a60405..d2b8344a047 100644
--- a/src/infra/bonjour.ts
+++ b/src/infra/bonjour.ts
@@ -1,6 +1,6 @@
 import { logDebug, logWarn } from "../logger.js";
 import { getLogger } from "../logging.js";
-import { ignoreCiaoUnhandledRejection } from "./bonjour-ciao.js";
+import { classifyCiaoUnhandledRejection } from "./bonjour-ciao.js";
 import { formatBonjourError } from "./bonjour-errors.js";
 import { isTruthyEnvValue } from "./env.js";
 import { registerUnhandledRejectionHandler } from "./unhandled-rejections.js";
@@ -94,6 +94,21 @@ function isAnnouncedState(state: BonjourServiceState | "unknown") {
   return String(state) === "announced";
 }
 
+function handleCiaoUnhandledRejection(reason: unknown): boolean {
+  const classification = classifyCiaoUnhandledRejection(reason);
+  if (!classification) {
+    return false;
+  }
+
+  if (classification.kind === "interface-assertion") {
+    logWarn(`bonjour: suppressing ciao interface assertion: ${classification.formatted}`);
+    return true;
+  }
+
+  logDebug(`bonjour: ignoring unhandled ciao rejection: ${classification.formatted}`);
+  return true;
+}
+
 export async function startGatewayBonjourAdvertiser(
   opts: GatewayBonjourAdvertiseOpts,
 ): Promise<GatewayBonjourAdvertiser> {
@@ -175,7 +190,7 @@ export async function startGatewayBonjourAdvertiser(
 
     const cleanupUnhandledRejection =
       services.length > 0
-        ? registerUnhandledRejectionHandler(ignoreCiaoUnhandledRejection)
+        ? registerUnhandledRejectionHandler(handleCiaoUnhandledRejection)
         : undefined;
 
     return { responder, services, cleanupUnhandledRejection };