diff --git a/src/infra/bonjour-ciao.test.ts b/src/infra/bonjour-ciao.test.ts
index d3acc4a2c73..3d9ec83f0f4 100644
--- a/src/infra/bonjour-ciao.test.ts
+++ b/src/infra/bonjour-ciao.test.ts
@@ -9,7 +9,7 @@ vi.mock("../logger.js", () => ({
 const { ignoreCiaoCancellationRejection } = await import("./bonjour-ciao.js");
 
 describe("bonjour-ciao", () => {
-  it("ignores and logs ciao cancellation rejections", () => {
+  it("ignores and logs ciao announcement cancellation rejections", () => {
     expect(
       ignoreCiaoCancellationRejection(new Error("Ciao announcement cancelled by shutdown")),
     ).toBe(true);
@@ -18,6 +18,15 @@ describe("bonjour-ciao", () => {
     );
   });
 
+  it("ignores and logs ciao probing cancellation rejections", () => {
+    logDebugMock.mockReset();
+
+    expect(ignoreCiaoCancellationRejection(new Error("CIAO PROBING CANCELLED"))).toBe(true);
+    expect(logDebugMock).toHaveBeenCalledWith(
+      expect.stringContaining("ignoring unhandled ciao rejection"),
+    );
+  });
+
   it("ignores lower-case string cancellation reasons too", () => {
     logDebugMock.mockReset();
 
diff --git a/src/infra/bonjour-ciao.ts b/src/infra/bonjour-ciao.ts
index 878997c6203..f39902c0aa7 100644
--- a/src/infra/bonjour-ciao.ts
+++ b/src/infra/bonjour-ciao.ts
@@ -1,9 +1,11 @@
 import { logDebug } from "../logger.js";
 import { formatBonjourError } from "./bonjour-errors.js";
 
+const CIAO_CANCELLATION_MESSAGE_RE = /^CIAO (?:ANNOUNCEMENT|PROBING) CANCELLED\b/u;
+
 export function ignoreCiaoCancellationRejection(reason: unknown): boolean {
   const message = formatBonjourError(reason).toUpperCase();
-  if (!message.includes("CIAO ANNOUNCEMENT CANCELLED")) {
+  if (!CIAO_CANCELLATION_MESSAGE_RE.test(message)) {
     return false;
   }
   logDebug(`bonjour: ignoring unhandled ciao rejection: ${formatBonjourError(reason)}`);