diff --git a/apps/dokploy/__test__/utils/auth-error.test.ts b/apps/dokploy/__test__/utils/auth-error.test.ts
new file mode 100644
index 000000000..b1da8dcdd
--- /dev/null
+++ b/apps/dokploy/__test__/utils/auth-error.test.ts
@@ -0,0 +1,89 @@
+import { SESSION_EXPIRED_MESSAGE } from "@/server/api/auth-constants";
+import {
+	isSessionExpiredError,
+	shouldRedirectOnAuthError,
+} from "@/utils/auth-error";
+import { TRPCClientError } from "@trpc/client";
+import { describe, expect, test } from "vitest";
+
+const makeSessionExpiredError = () => {
+	const error = new TRPCClientError(SESSION_EXPIRED_MESSAGE);
+	(error as any).data = { code: "UNAUTHORIZED" };
+	return error;
+};
+
+// UNAUTHORIZED, but from a permission/role check on a still-valid session.
+const makePermissionDeniedError = () => {
+	const error = new TRPCClientError("You don't have access to this project");
+	(error as any).data = { code: "UNAUTHORIZED" };
+	return error;
+};
+
+const makeForbiddenError = () => {
+	const error = new TRPCClientError("Forbidden");
+	(error as any).data = { code: "FORBIDDEN" };
+	return error;
+};
+
+describe("isSessionExpiredError", () => {
+	test("returns true for an UNAUTHORIZED error tagged as session-expired", () => {
+		expect(isSessionExpiredError(makeSessionExpiredError())).toBe(true);
+	});
+
+	// Regression for #4310: the API reuses UNAUTHORIZED for permission denials
+	// on authenticated users; those must NOT be treated as session expiry.
+	test("returns false for a permission-denied UNAUTHORIZED error", () => {
+		expect(isSessionExpiredError(makePermissionDeniedError())).toBe(false);
+	});
+
+	test("returns false for a different code", () => {
+		expect(isSessionExpiredError(makeForbiddenError())).toBe(false);
+	});
+
+	test("returns false for a plain Error / null / undefined", () => {
+		expect(isSessionExpiredError(new Error(SESSION_EXPIRED_MESSAGE))).toBe(false);
+		expect(isSessionExpiredError(null)).toBe(false);
+		expect(isSessionExpiredError(undefined)).toBe(false);
+	});
+});
+
+describe("shouldRedirectOnAuthError", () => {
+	test("returns false on public paths even with a session-expired error", () => {
+		const error = makeSessionExpiredError();
+		expect(shouldRedirectOnAuthError("/", error)).toBe(false);
+		expect(shouldRedirectOnAuthError("/register", error)).toBe(false);
+		expect(shouldRedirectOnAuthError("/invitation/abc", error)).toBe(false);
+		expect(shouldRedirectOnAuthError("/accept-invitation/abc", error)).toBe(
+			false,
+		);
+		expect(shouldRedirectOnAuthError("/reset-password", error)).toBe(false);
+		expect(shouldRedirectOnAuthError("/send-reset-password", error)).toBe(false);
+	});
+
+	test("returns true for a protected path with a session-expired error", () => {
+		expect(
+			shouldRedirectOnAuthError(
+				"/dashboard/project/abc",
+				makeSessionExpiredError(),
+			),
+		).toBe(true);
+	});
+
+	test("returns false for a protected path with a permission-denied error", () => {
+		expect(
+			shouldRedirectOnAuthError(
+				"/dashboard/project/abc",
+				makePermissionDeniedError(),
+			),
+		).toBe(false);
+	});
+
+	test("returns false for a protected path with a non-auth error", () => {
+		expect(
+			shouldRedirectOnAuthError("/dashboard/project/abc", makeForbiddenError()),
+		).toBe(false);
+		expect(
+			shouldRedirectOnAuthError("/dashboard/project/abc", new Error("nope")),
+		).toBe(false);
+	});
+});
diff --git a/apps/dokploy/server/api/auth-constants.ts b/apps/dokploy/server/api/auth-constants.ts
new file mode 100644
index 000000000..2371de533
--- /dev/null
+++ b/apps/dokploy/server/api/auth-constants.ts
@@ -0,0 +1,12 @@
+/**
+ * Sentinel message attached to UNAUTHORIZED errors that specifically mean
+ * "there is no valid session" (i.e. the session expired or is missing), as
+ * opposed to the many UNAUTHORIZED errors that represent an authenticated user
+ * lacking a role/resource permission.
+ *
+ * The client (utils/auth-error.ts) keys the "redirect to login" behaviour off
+ * this exact message so that permission denials do NOT bounce logged-in users
+ * off their page. Keep this file dependency-free so it can be imported from
+ * both server and client code.
+ */
+export const SESSION_EXPIRED_MESSAGE = "SESSION_EXPIRED";
diff --git a/apps/dokploy/server/api/trpc.ts b/apps/dokploy/server/api/trpc.ts
index d0b43e76f..5ccaafed3 100644
--- a/apps/dokploy/server/api/trpc.ts
+++ b/apps/dokploy/server/api/trpc.ts
@@ -19,6 +19,7 @@ import type { CreateNextContextOptions } from "@trpc/server/adapters/next";
 import type { Session, User } from "better-auth";
 import superjson from "superjson";
 import { ZodError } from "zod";
+import { SESSION_EXPIRED_MESSAGE } from "./auth-constants";
 
 type Resource = keyof typeof statements;
 type ActionOf<R extends Resource> = (typeof statements)[R][number];
@@ -160,7 +161,10 @@ export const publicProcedure = t.procedure;
  */
 export const protectedProcedure = t.procedure.use(({ ctx, next }) => {
 	if (!ctx.session || !ctx.user) {
-		throw new TRPCError({ code: "UNAUTHORIZED" });
+		throw new TRPCError({
+			code: "UNAUTHORIZED",
+			message: SESSION_EXPIRED_MESSAGE,
+		});
 	}
 	return next({
 		ctx: {
@@ -173,11 +177,13 @@ export const protectedProcedure = t.procedure.use(({ ctx, next }) => {
 });
 
 export const cliProcedure = t.procedure.use(({ ctx, next }) => {
-	if (
-		!ctx.session ||
-		!ctx.user ||
-		(ctx.user.role !== "owner" && ctx.user.role !== "admin")
-	) {
+	if (!ctx.session || !ctx.user) {
+		throw new TRPCError({
+			code: "UNAUTHORIZED",
+			message: SESSION_EXPIRED_MESSAGE,
+		});
+	}
+	if (ctx.user.role !== "owner" && ctx.user.role !== "admin") {
 		throw new TRPCError({ code: "UNAUTHORIZED" });
 	}
 	return next({
@@ -191,11 +197,13 @@ export const cliProcedure = t.procedure.use(({ ctx, next }) => {
 });
 
 export const adminProcedure = t.procedure.use(({ ctx, next }) => {
-	if (
-		!ctx.session ||
-		!ctx.user ||
-		(ctx.user.role !== "owner" && ctx.user.role !== "admin")
-	) {
+	if (!ctx.session || !ctx.user) {
+		throw new TRPCError({
+			code: "UNAUTHORIZED",
+			message: SESSION_EXPIRED_MESSAGE,
+		});
+	}
+	if (ctx.user.role !== "owner" && ctx.user.role !== "admin") {
 		throw new TRPCError({ code: "UNAUTHORIZED" });
 	}
 	return next({
@@ -214,11 +222,13 @@ export const adminProcedure = t.procedure.use(({ ctx, next }) => {
  * is used in the UI gate and when activating/validating keys.
  */
 export const enterpriseProcedure = t.procedure.use(async ({ ctx, next }) => {
-	if (
-		!ctx.session ||
-		!ctx.user ||
-		(ctx.user.role !== "owner" && ctx.user.role !== "admin")
-	) {
+	if (!ctx.session || !ctx.user) {
+		throw new TRPCError({
+			code: "UNAUTHORIZED",
+			message: SESSION_EXPIRED_MESSAGE,
+		});
+	}
+	if (ctx.user.role !== "owner" && ctx.user.role !== "admin") {
 		throw new TRPCError({ code: "UNAUTHORIZED" });
 	}
 
diff --git a/apps/dokploy/utils/api.ts b/apps/dokploy/utils/api.ts
index d7f165f6a..3ccd677ca 100644
--- a/apps/dokploy/utils/api.ts
+++ b/apps/dokploy/utils/api.ts
@@ -1,3 +1,4 @@
+import { MutationCache, QueryCache } from "@tanstack/react-query";
 import {
 	createWSClient,
 	httpBatchLink,
@@ -9,6 +10,7 @@ import { createTRPCNext } from "@trpc/next";
 import type { inferRouterInputs, inferRouterOutputs } from "@trpc/server";
 import superjson from "superjson";
 import type { AppRouter } from "@/server/api/root";
+import { handleAuthError } from "@/utils/auth-error";
 
 const getBaseUrl = () => {
 	if (typeof window !== "undefined") return "";
@@ -71,9 +73,18 @@ const links =
 				}),
 			];
 
+const queryClientConfig = {
+	queryCache: new QueryCache({
+		onError: (error: unknown) => handleAuthError(error),
+	}),
+	mutationCache: new MutationCache({
+		onError: (error: unknown) => handleAuthError(error),
+	}),
+};
+
 export const api = createTRPCNext<AppRouter>({
 	config() {
-		return { links };
+		return { links, queryClientConfig };
 	},
 	ssr: false,
 	transformer: superjson,
diff --git a/apps/dokploy/utils/auth-error.ts b/apps/dokploy/utils/auth-error.ts
new file mode 100644
index 000000000..94e5c53d6
--- /dev/null
+++ b/apps/dokploy/utils/auth-error.ts
@@ -0,0 +1,57 @@
+import { SESSION_EXPIRED_MESSAGE } from "@/server/api/auth-constants";
+import { TRPCClientError } from "@trpc/client";
+
+const PUBLIC_PATH_PREFIXES = [
+	"/register",
+	"/invitation",
+	"/accept-invitation",
+	"/reset-password",
+	"/send-reset-password",
+];
+
+/**
+ * Returns true only for the specific UNAUTHORIZED error that means the session
+ * is missing/expired (tagged server-side with SESSION_EXPIRED_MESSAGE).
+ *
+ * This is deliberately NOT every UNAUTHORIZED error: the API reuses the
+ * UNAUTHORIZED code for authenticated users who lack a role or resource
+ * permission. Redirecting those to login would yank logged-in users off their
+ * page on any permission denial, so we match the sentinel message instead.
+ */
+export const isSessionExpiredError = (error: unknown): boolean => {
+	if (!(error instanceof TRPCClientError)) return false;
+	const code = (error.data as { code?: string } | null | undefined)?.code;
+	return code === "UNAUTHORIZED" && error.message === SESSION_EXPIRED_MESSAGE;
+};
+
+/**
+ * Decides whether an auth error should trigger a redirect to the login screen.
+ * Public/unauthenticated pages never redirect, and only a genuine expired
+ * session (not a permission denial) qualifies.
+ */
+export const shouldRedirectOnAuthError = (
+	pathname: string,
+	error: unknown,
+): boolean => {
+	if (!isSessionExpiredError(error)) return false;
+	if (pathname === "/") return false;
+	if (PUBLIC_PATH_PREFIXES.some((prefix) => pathname.startsWith(prefix)))
+		return false;
+	return true;
+};
+
+let isRedirecting = false;
+
+/**
+ * Side-effecting handler wired into the global tRPC query/mutation caches.
+ * Redirects the browser to the login screen exactly once when an expired
+ * session is detected on a protected page.
+ */
+export const handleAuthError = (error: unknown): void => {
+	if (typeof window === "undefined") return;
+	if (isRedirecting) return;
+	if (!shouldRedirectOnAuthError(window.location.pathname, error)) return;
+
+	isRedirecting = true;
+	window.location.href = "/";
+};