Most of the time it's one of two harmless things: your sign-in expired (sessions last 5 days), or your browser is blocking the cookie that keeps you signed in. Try logging out and back in first — if that bounces you straight back to the login screen, the cookie is the culprit.
What's happening
When you sign in, ZiplineOS gives your browser a token — a cookie called __session. Every request carries that cookie to prove who you are. If it's missing, expired, or blocked, the system treats you as a stranger and redirects you to login. The loop happens because the cookie isn't sticking, not because your password is wrong.
The three usual causes
| What you're seeing | What it means | What to try |
|---|---|---|
| Signed in earlier, now logged out | Session expired (5 days) | Sign in again |
| Log in, immediately bounced back — over and over | Browser blocking the sign-in cookie | See steps below |
| Whole team logged out at once | Recent update or short outage | Wait a few minutes, sign in again |
Session expiry is normal and expected — signing back in fixes it completely.
Cookie blocked — the sign-in cookie must be shared across ZiplineOS portals. Strict privacy settings, ad/privacy extensions, or Safari's tracking protection can block this, causing the loop.
Update or outage — after a deployment, existing sessions can be invalidated all at once. It self-corrects on the next sign-in.
If you're stuck in a loop
Work through these in order:
- Sign out fully, then sign back in. Clears a stale or expired session.
- Try a normal browser window with default privacy settings — not incognito, extensions paused. If it works here, a privacy setting was blocking the cookie.
- Allow cookies for ZiplineOS in your browser's privacy settings. Safari users may need to turn off "Prevent cross-site tracking" for ZiplineOS.
- Try Chrome with default settings. If the loop disappears, the issue is your other browser's configuration.
If a fresh Chrome window fixes it, the problem is a privacy/cookie setting in your usual browser — not your account. No need to wait on support.
When to contact support
- You've tried the steps above and are still looping.
- Multiple people on your team are locked out and it hasn't cleared within a few minutes.
- Your account shows as deactivated — that's intentional and needs an admin to reactivate.
When you contact support, mention: when it started, whether it's just you or the whole team, and which browser you're using.