diff --git a/.changeset/secure-token-cookies-over-https.md b/.changeset/secure-token-cookies-over-https.md
new file mode 100644
index 00000000..672b22db
--- /dev/null
+++ b/.changeset/secure-token-cookies-over-https.md
@@ -0,0 +1,13 @@
+---
+"@baseapp-frontend/utils": patch
+"@baseapp-frontend/authentication": patch
+---
+
+Token cookies are `Secure` only when the page is served over HTTPS. Keying the flag on
+`NODE_ENV` broke login on production builds served over plain HTTP (a LAN or a staging host
+without TLS): browsers drop `Secure` cookies set from HTTP pages, so the tokens were never
+stored and `/users/me` answered 401.
+
+- New `shouldUseSecureCookies()` in `@baseapp-frontend/utils`: the page's protocol in the
+  browser, the previous `NODE_ENV` rule elsewhere.
+- `useLogin` and `refreshAccessToken` use it.
diff --git a/packages/authentication/modules/access/useLogin/index.ts b/packages/authentication/modules/access/useLogin/index.ts
index 352fe9b5..d3d1aa2e 100644
--- a/packages/authentication/modules/access/useLogin/index.ts
+++ b/packages/authentication/modules/access/useLogin/index.ts
@@ -8,6 +8,7 @@ import {
   decodeJWT,
   setFormApiErrors,
   setTokenAsync,
+  shouldUseSecureCookies,
 } from '@baseapp-frontend/utils'
 import { isMobilePlatform } from '@baseapp-frontend/utils/functions/os'
 
@@ -80,10 +81,10 @@ const useLogin = <TApiClass extends ApiClass = typeof AuthApi>({
     }
 
     await setTokenAsync(accessKeyName, response.access, {
-      secure: process.env.NODE_ENV === 'production',
+      secure: shouldUseSecureCookies(),
     })
     await setTokenAsync(refreshKeyName, response.refresh, {
-      secure: process.env.NODE_ENV === 'production',
+      secure: shouldUseSecureCookies(),
     })
   }
 
diff --git a/packages/utils/functions/token/index.ts b/packages/utils/functions/token/index.ts
index 04c42fe7..e8984253 100644
--- a/packages/utils/functions/token/index.ts
+++ b/packages/utils/functions/token/index.ts
@@ -6,3 +6,4 @@ export * from './isUserTokenValid'
 export * from './refreshAccessToken'
 export * from './removeTokenAsync'
 export * from './setTokenAsync'
+export * from './shouldUseSecureCookies'
diff --git a/packages/utils/functions/token/refreshAccessToken/index.ts b/packages/utils/functions/token/refreshAccessToken/index.ts
index 410309de..31a92ca8 100644
--- a/packages/utils/functions/token/refreshAccessToken/index.ts
+++ b/packages/utils/functions/token/refreshAccessToken/index.ts
@@ -2,6 +2,7 @@ import { ACCESS_KEY_NAME, REFRESH_KEY_NAME } from '../../../constants/jwt'
 import { getAccessToken } from '../getAccessToken'
 import { removeTokenAsync } from '../removeTokenAsync'
 import { setTokenAsync } from '../setTokenAsync'
+import { shouldUseSecureCookies } from '../shouldUseSecureCookies'
 import { RefreshAccessTokenParams } from './types'
 
 export const refreshAccessToken = async ({
@@ -13,7 +14,7 @@ export const refreshAccessToken = async ({
     const accessToken = await getAccessToken(refreshToken)
 
     await setTokenAsync(accessKeyName, accessToken, {
-      secure: process.env.NODE_ENV === 'production',
+      secure: shouldUseSecureCookies(),
     })
 
     return accessToken
diff --git a/packages/utils/functions/token/shouldUseSecureCookies/__tests__/shouldUseSecureCookies.test.ts b/packages/utils/functions/token/shouldUseSecureCookies/__tests__/shouldUseSecureCookies.test.ts
new file mode 100644
index 00000000..26aace8f
--- /dev/null
+++ b/packages/utils/functions/token/shouldUseSecureCookies/__tests__/shouldUseSecureCookies.test.ts
@@ -0,0 +1,26 @@
+import { shouldUseSecureCookies } from '..'
+
+describe('shouldUseSecureCookies', () => {
+  const originalLocation = window.location
+
+  const setProtocol = (protocol: string) => {
+    Object.defineProperty(window, 'location', {
+      configurable: true,
+      value: { ...originalLocation, protocol },
+    })
+  }
+
+  afterEach(() => {
+    Object.defineProperty(window, 'location', { configurable: true, value: originalLocation })
+  })
+
+  it('is secure on HTTPS pages', () => {
+    setProtocol('https:')
+    expect(shouldUseSecureCookies()).toBe(true)
+  })
+
+  it('is not secure on plain-HTTP pages, whatever NODE_ENV says', () => {
+    setProtocol('http:')
+    expect(shouldUseSecureCookies()).toBe(false)
+  })
+})
diff --git a/packages/utils/functions/token/shouldUseSecureCookies/index.ts b/packages/utils/functions/token/shouldUseSecureCookies/index.ts
new file mode 100644
index 00000000..91fee328
--- /dev/null
+++ b/packages/utils/functions/token/shouldUseSecureCookies/index.ts
@@ -0,0 +1,14 @@
+/**
+ * Whether token cookies should be `Secure`.
+ *
+ * Browsers drop `Secure` cookies set from plain-HTTP pages (except on localhost), so keying the
+ * flag on `NODE_ENV` breaks login on a production build served over HTTP, e.g. on a LAN or a
+ * staging host without TLS: the tokens are never stored and every request is anonymous. In the
+ * browser this follows the page's protocol; elsewhere (SSR, native) it keeps the `NODE_ENV` rule.
+ */
+export const shouldUseSecureCookies = (): boolean => {
+  if (typeof window !== 'undefined' && window.location?.protocol) {
+    return window.location.protocol === 'https:'
+  }
+  return process.env.NODE_ENV === 'production'
+}