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Cursor Authentication Error Not Logged In

When Cursor shows Authentication error and If you are logged in, try logging out and back in, Sign Out, fully quit from the tray, then Sign In.

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Last checked
Sep 12, 2026
Applies to
Windows, Mac, Desktop
Fix status
Community Confirmed
Fastest useful check

Quick answer

Match Authentication error with If you are logged in, try logging out and back in, often logged as ERROR_NOT_LOGGED_IN or ActionRequiredError. In Cursor Settings, Sign Out, then fully quit Cursor from the system tray. Closing the window alone is not enough. Reopen Cursor and Sign In, completing the browser return. If a password reset left a stale session, sign out on cursor.com first, then Sign In again. For overnight desktop sessions, try Developer: Reload Window once, then use the same Sign Out and full quit leftover if the screen returns. This is not Connection failed, not Unable to reach the model provider, and not No resource accessor found for composer.

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What we're seeing

  • The exact screen is Authentication error with If you are logged in, try logging out and back in. Logs often name ERROR_NOT_LOGGED_IN or ActionRequiredError.
  • Independent June–September 2026 first-hand Cursor forum reports quote that pairing on Windows and Mac, including overnight Enterprise sessions and after a password reset.
  • Staff replies for this fingerprint tell people to Sign Out from Settings, fully quit from the tray, then Sign In again.
  • A different banner such as Connection failed. Please try again, or contact support, Unable to reach the model provider, or No resource accessor found for composer is a different fingerprint.
  • Usage-limit and rate-limit waits are out of scope.

Start here

Try these first

Fix 1

Confirm Authentication error

Community Confirmed

Match the login-expired screen before changing network, MCP, or workspace settings.

  1. Read the error. This guide is for Authentication error with If you are logged in, try logging out and back in.
  2. If logs are visible, confirm ERROR_NOT_LOGGED_IN or ActionRequiredError.
  3. If the banner is Connection failed. Please try again, or contact support, stop here and use that separate guide.
  4. If the internal sentence is No resource accessor found for composer, stop here and use that separate guide.

Applies to Windows, Mac, Desktop

Fix 2

Sign Out, fully quit, then Sign In

Community Confirmed

August and September 2026 first-hand reports with this exact screen cleared after Sign Out from Settings, a tray-level quit, and a fresh Sign In. Staff replies treat closing the window as not enough.

  1. Open Cursor Settings and choose Sign Out. Do not rely only on a button on the error toast.
  2. Fully quit Cursor from the system tray or menu bar. Closing the last window is not enough.
  3. Reopen Cursor and Sign In, completing the browser return to the app.
  4. Retry Agent or Chat once the account name is visible again.

Applies to Windows, Mac, Desktop

Fix 3

Sign out on cursor.com if the session is stale

Community Confirmed

Staff replies for password-reset cases describe a leftover web session that still looks signed in locally. Signing out on the website first forces a new token.

  1. In a browser, open cursor.com and sign out of the same account.
  2. Return to Cursor, confirm you are signed out locally, then Sign In again.
  3. Complete the browser return and confirm Authentication error is gone.

Applies to Windows, Mac, Desktop

Fix 4

Reload once after an overnight session

Community Confirmed

A first-hand Enterprise Windows report shows this screen after leaving Cursor open overnight. Reload Window can wake a stale session; if the screen remains, use the Sign Out leftover.

  1. If the error appeared after a long idle or overnight session, run Developer: Reload Window once.
  2. If Authentication error remains, Sign Out, fully quit from the tray, and Sign In again.

Applies to Windows, Mac, Desktop

Device notes

Windows
The tray icon is the reliable full-quit path. Overnight Enterprise sessions and stale tokens after a password reset are common for this screen.
Mac
Use the menu-bar quit after Sign Out. Closing the last window can leave Cursor running.
Desktop
This is a stale-session fingerprint, not HTTP/1.1, MCP disable, certificate trust, or a missing workspace folder.

Official information

Checked on 12 September 2026, Cursor staff replies on forum threads that quote Authentication error and If you are logged in, try logging out and back in describe ERROR_NOT_LOGGED_IN stale sessions and recommend Sign Out, a full quit from the tray, and Sign In. There is no separate Help Center article that names only this exact pairing.

Sources

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