diff --git a/apps/docs/docs/integrations/whats-up-docker/index.mdx b/apps/docs/docs/integrations/whats-up-docker/index.mdx
index 31a0127f5..85707365e 100644
--- a/apps/docs/docs/integrations/whats-up-docker/index.mdx
+++ b/apps/docs/docs/integrations/whats-up-docker/index.mdx
@@ -24,12 +24,14 @@ The What's Up Docker integration lets Homarr connect to your [WUD](https://githu
 <AddingIntegration />
 
 :::info URL configuration
-Use the root URL of your WUD instance, for example `https://wud.example.com`. Homarr calls the `/api/app` and `/api/containers` endpoints under that URL automatically.
+Use the root URL of your WUD instance, for example `https://wud.example.com`. Homarr uses `/api/containers` under that URL for both connection testing and widget data.
 :::
 
 ### Secrets
 
-WUD does not require authentication by default. If your instance is protected with [Basic Authentication](https://github.com/getwud/wud/blob/main/docs/configuration/authentications/basic/README.md), you can provide a username and password.
+WUD 9 requires authentication. Enter your WUD username and password in Homarr; the initial admin credentials configured with `WUD_AUTH_ADMIN_USER` and `WUD_AUTH_ADMIN_PASSWORD` work with Basic authentication. Older WUD versions without authentication can leave both fields empty.
+
+Credentials are sent to the configured URL over HTTP or HTTPS. Use HTTPS outside a trusted internal network.
 
 <IntegrationSecrets
   secrets={[
@@ -40,7 +42,7 @@ WUD does not require authentication by default. If your instance is protected wi
     {
       credentials: ["username", "password"],
       steps: [
-        "Open your WUD instance's configuration and configure a WUD_AUTH_BASIC_* user as described in the WUD documentation",
+        "Use your WUD account credentials; older versions can use a configured WUD_AUTH_BASIC_* user",
         "Enter that username and password in Homarr — Basic authentication is handled automatically",
       ],
     },
diff --git a/packages/integrations/src/wud/test/wud-integration.spec.ts b/packages/integrations/src/wud/test/wud-integration.spec.ts
index 902707fd8..146c17361 100644
--- a/packages/integrations/src/wud/test/wud-integration.spec.ts
+++ b/packages/integrations/src/wud/test/wud-integration.spec.ts
@@ -198,7 +198,7 @@ describe("WudIntegration authentication", () => {
     expect(requestInit?.timeout).toBe(10_000);
   });
 
-  test("does not send credentials over a non-HTTPS URL", async () => {
+  test("sends configured Basic auth credentials over an HTTP URL", async () => {
     mockFetch.mockResolvedValue(
       new Response(JSON.stringify(sampleContainersResponse), {
         status: 200,
@@ -209,7 +209,7 @@ describe("WudIntegration authentication", () => {
     const integration = new WudIntegration({
       id: "test-wud-http",
       name: "Test WUD HTTP",
-      url: "http://wud.example.com",
+      url: "http://wud:3000",
       externalUrl: null,
       decryptedSecrets: [
         { kind: "username", value: TEST_USERNAME },
@@ -221,7 +221,7 @@ describe("WudIntegration authentication", () => {
 
     const [, requestInit] = mockFetch.mock.calls[0] ?? [];
     const headers = (requestInit?.headers ?? {}) as Record<string, string>;
-    expect(headers.Authorization).toBeUndefined();
+    expect(headers.Authorization).toBe(`Basic ${Buffer.from(`${TEST_USERNAME}:${TEST_PASSWORD}`).toString("base64")}`);
   });
 });
 
@@ -238,15 +238,16 @@ describe("WudIntegration testing endpoint", () => {
       fetchAsync: vi.fn().mockResolvedValue(response),
     }) as unknown as IntegrationTestingInput;
 
-  test("returns success when /api/app responds 200", async () => {
-    const input = makeInput(new Response(JSON.stringify({ name: "wud", version: "5.0.0" }), { status: 200 }));
+  test("returns success when /api/containers responds 200", async () => {
+    const input = makeInput(new Response(JSON.stringify(sampleContainersResponse), { status: 200 }));
 
     const result = await invokeTesting(createIntegration(), input);
 
     expect(result.success).toBe(true);
+    expect(String(vi.mocked(input.fetchAsync).mock.calls[0]?.[0])).toBe(`${TEST_URL}/api/containers`);
   });
 
-  test("returns a status-code failure when /api/app responds non-OK", async () => {
+  test("returns a status-code failure when /api/containers responds non-OK", async () => {
     const input = makeInput(new Response("unauthorized", { status: 401 }));
 
     const result = await invokeTesting(createIntegration(), input);
@@ -255,7 +256,7 @@ describe("WudIntegration testing endpoint", () => {
   });
 
   test("passes the Basic auth header through to fetchAsync when configured", async () => {
-    const response = new Response(JSON.stringify({ name: "wud", version: "5.0.0" }), { status: 200 });
+    const response = new Response(JSON.stringify(sampleContainersResponse), { status: 200 });
     const input = makeInput(response);
 
     await invokeTesting(createIntegrationWithBasicAuth(), input);
diff --git a/packages/integrations/src/wud/wud-integration.ts b/packages/integrations/src/wud/wud-integration.ts
index d7bdb49eb..05c6cc17a 100644
--- a/packages/integrations/src/wud/wud-integration.ts
+++ b/packages/integrations/src/wud/wud-integration.ts
@@ -14,7 +14,7 @@ const CONTAINERS_REQUEST_TIMEOUT_MS = 10_000;
 
 export class WudIntegration extends Integration {
   protected async testingAsync(input: IntegrationTestingInput): Promise<TestingResult> {
-    const response = await input.fetchAsync(this.url("/api/app"), {
+    const response = await input.fetchAsync(this.url("/api/containers"), {
       headers: this.getAuthHeaders(),
     });
 
@@ -23,10 +23,10 @@ export class WudIntegration extends Integration {
     }
 
     try {
-      await response.json();
+      await parseWudContainersResponseAsync(response);
     } catch (error) {
       return TestConnectionError.ParseResult(
-        new ParseError("Invalid WUD app response", {
+        new ParseError("Invalid WUD containers response", {
           cause: error instanceof Error ? error : new Error(String(error)),
         }),
       );
@@ -55,10 +55,6 @@ export class WudIntegration extends Integration {
       return undefined;
     }
 
-    if (this.url("/api/app").protocol !== "https:") {
-      return undefined;
-    }
-
     const credentials = Buffer.from(`${this.getSecretValue("username")}:${this.getSecretValue("password")}`).toString(
       "base64",
     );