diff --git a/src/ui/auth/Auth.tsx b/src/ui/auth/Auth.tsx
index df1fed65a..7d6557daa 100644
--- a/src/ui/auth/Auth.tsx
+++ b/src/ui/auth/Auth.tsx
@@ -296,6 +296,15 @@ export function Auth({ onLogin }: AuthProps) {
   const [pendingToken, setPendingToken] = useState("");
   const [secondFactors, setSecondFactors] = useState<SecondFactorRef[]>([]);
   const [activeFactorId, setActiveFactorId] = useState("");
+  const [authPluginsLoading, setAuthPluginsLoading] = useState(true);
+  const retryAuthPlugins = async () => {
+    setAuthPluginsLoading(true);
+    try {
+      await startPreLoginPlugins({ retryFailed: true });
+    } finally {
+      setAuthPluginsLoading(false);
+    }
+  };
   const loginMethodUIs = useLoginMethods();
   const secondFactorUIs = useSecondFactors();
   // A server that did not list its factors gets every factor with a UI here.
@@ -434,7 +443,9 @@ export function Auth({ onLogin }: AuthProps) {
       .then((allowed) => setPasswordResetAllowed(allowed))
       .catch(() => setPasswordResetAllowed(false));
     // Plugins that draw login or second-factor UI load before sign-in.
-    void startPreLoginPlugins().catch(() => {});
+    void startPreLoginPlugins()
+      .catch(() => {})
+      .finally(() => setAuthPluginsLoading(false));
     getLoginMethods()
       .then((methods) => setAuthMethods(methods))
       .catch(() => setAuthMethods([]))
@@ -1364,9 +1375,24 @@ export function Auth({ onLogin }: AuthProps) {
                   );
                   if (!ui) {
                     return (
-                      <p className="text-xs text-destructive">
-                        {t("auth.secondFactorNoUI")}
-                      </p>
+                      <div className="space-y-2" aria-live="polite">
+                        <p className="text-xs text-muted-foreground">
+                          {t(
+                            authPluginsLoading
+                              ? "common.loading"
+                              : "auth.secondFactorNoUI",
+                          )}
+                        </p>
+                        <Button
+                          type="button"
+                          disabled={authPluginsLoading}
+                          onClick={() =>
+                            void retryAuthPlugins().catch(() => {})
+                          }
+                        >
+                          {t("auth.retrySecondFactorUI")}
+                        </Button>
+                      </div>
                     );
                   }
                   const Component = ui.component;
diff --git a/src/ui/locales/en.json b/src/ui/locales/en.json
index a19249f17..70f962e7c 100644
--- a/src/ui/locales/en.json
+++ b/src/ui/locales/en.json
@@ -1060,7 +1060,8 @@
     "secondFactorUnavailable": "Your account uses a second factor that is not available right now. Contact an admin to reset it.",
     "secondFactorNoUI": "This second factor cannot be shown on this screen. Contact an admin.",
     "serverAuthentication": "Server sign-in",
-    "minChars": "min. {{min}} characters"
+    "minChars": "min. {{min}} characters",
+    "retrySecondFactorUI": "Reload verification methods"
   },
   "hostKey": {
     "verifyNewHost": "Verify SSH Host Key",
diff --git a/src/ui/locales/translated/zh_CN.json b/src/ui/locales/translated/zh_CN.json
index 0815591a4..f684ef5a2 100644
--- a/src/ui/locales/translated/zh_CN.json
+++ b/src/ui/locales/translated/zh_CN.json
@@ -1058,7 +1058,8 @@
     "secondFactorUnavailable": "Your account uses a second factor that is not available right now. Contact an admin to reset it.",
     "secondFactorNoUI": "This second factor cannot be shown on this screen. Contact an admin.",
     "serverAuthentication": "Server sign-in",
-    "minChars": "min. {{min}} characters"
+    "minChars": "min. {{min}} characters",
+    "retrySecondFactorUI": "重新加载验证方式"
   },
   "hostKey": {
     "verifyNewHost": "验证 SSH 主机密钥",
diff --git a/src/ui/plugin-host/loader.ts b/src/ui/plugin-host/loader.ts
index d20811444..d40d93143 100644
--- a/src/ui/plugin-host/loader.ts
+++ b/src/ui/plugin-host/loader.ts
@@ -449,7 +449,9 @@ async function fetchPreLoginPlugins(): Promise<PluginSummary[]> {
  * factors) before anyone has signed in. After sign-in the full runtime
  * reconciles, keeping these active when their bundle has not changed.
  */
-export async function startPreLoginPlugins(): Promise<void> {
+export async function startPreLoginPlugins(
+  options: { retryFailed?: boolean } = {},
+): Promise<void> {
   installPluginHostBridge();
   let list: PluginSummary[];
   try {
@@ -468,6 +470,9 @@ export async function startPreLoginPlugins(): Promise<void> {
     // subset would unload everything else. Auth remounts during the
     // post-login fade, so this runs after sign-in every time.
     if (started) return;
+    if (options.retryFailed) {
+      for (const plugin of list) failedVersions.delete(plugin.id);
+    }
     await reconcile(list);
     markPluginsSettled();
   });
diff --git a/src/ui/tests/auth/AuthLoginMethods.test.tsx b/src/ui/tests/auth/AuthLoginMethods.test.tsx
index c281c6908..57bb87b8f 100644
--- a/src/ui/tests/auth/AuthLoginMethods.test.tsx
+++ b/src/ui/tests/auth/AuthLoginMethods.test.tsx
@@ -71,6 +71,7 @@ vi.mock("sonner", () => ({
 }));
 
 import { Auth } from "../../auth/Auth";
+import { startPreLoginPlugins } from "@/plugin-host/loader";
 import {
   registerLoginMethod,
   registerSecondFactor,
@@ -270,6 +271,30 @@ describe("login methods on the login screen", () => {
     }
   });
 
+  it("recovers an unavailable second-factor UI without restarting the login", async () => {
+    window.history.replaceState({}, "", "/?second_factor=1&second_factors=pin");
+    render(<Auth onLogin={vi.fn()} />);
+    expect(await screen.findByText("auth.secondFactorNoUI")).toBeTruthy();
+    let dispose = () => {};
+    vi.mocked(startPreLoginPlugins).mockImplementationOnce(async () => {
+      dispose = registerSecondFactor({
+        id: "pin",
+        pluginId: "corp",
+        titleKey: "corp.pin",
+        component: () => <span>recovered challenge</span>,
+      });
+    });
+    try {
+      fireEvent.click(screen.getByText("auth.retrySecondFactorUI"));
+      expect(await screen.findByText("recovered challenge")).toBeTruthy();
+      expect(startPreLoginPlugins).toHaveBeenLastCalledWith({
+        retryFailed: true,
+      });
+    } finally {
+      dispose();
+    }
+  });
+
   it("offers every registered factor when the server lists none", async () => {
     const dispose = registerSecondFactor({
       id: "pin",
diff --git a/src/ui/tests/plugin-host/loader.test.tsx b/src/ui/tests/plugin-host/loader.test.tsx
index afbfa0797..acd56dbfe 100644
--- a/src/ui/tests/plugin-host/loader.test.tsx
+++ b/src/ui/tests/plugin-host/loader.test.tsx
@@ -232,6 +232,20 @@ describe("plugin loader", () => {
     expect(isPluginFrontendActive("alpha")).toBe(true);
   });
 
+  it("retries failed login bundles only when explicitly requested", async () => {
+    vi.spyOn(console, "error").mockImplementation(() => {});
+    vi.spyOn(globalThis, "fetch").mockImplementation(
+      async () => new Response(JSON.stringify([summary("login")])),
+    );
+    await startPreLoginPlugins();
+    expect(isPluginFrontendActive("login")).toBe(false);
+    modules.login = railPlugin("login");
+    await startPreLoginPlugins();
+    expect(isPluginFrontendActive("login")).toBe(false);
+    await startPreLoginPlugins({ retryFailed: true });
+    expect(isPluginFrontendActive("login")).toBe(true);
+  });
+
   it("ignores a pre-login load started after sign-in", async () => {
     modules.login = railPlugin("login");
     modules.alpha = railPlugin("alpha");