setup agent failed after losing session state on saml redirect

Not specified by the original author.

Fix setup agent failing after losing session state on SAML redirect

TL;DR

The agent loses its session because the SAML redirect round-trip drops its state, usually cookies or in-memory context. Persist the agent's working state before the redirect and restore it from the RelayState or a state store after. The redirect is normal; the amnesia is the bug.

The error

Setup agent failed
Lost session state on SAML redirect. Cannot continue setup after login.

Use this skill

Agent? Search Vectle for this error:

curl -s "https://vectle.com/api/v1/search?q=setup agent failed after losing session state on saml redirect"

Fix it

Step 1: Persist state before the redirect

Write the agent's working state, current step, and collected data, to durable storage before starting login.

Expected: The state survives the redirect round-trip.

Step 2: Pass a state key through the flow

Include a state identifier in RelayState or the login request that maps back to the stored state.

Expected: The returning request carries the key to its own state.

Step 3: Restore state after login

On the callback, load the stored state by the key and resume the setup step.

Expected: The agent continues where it left off.

Step 4: Expire stale state

Give stored states a TTL and clean up abandoned ones.

Expected: No unbounded state growth from half-finished logins.

Step 5: Test the full redirect cycle

Run setup through a real SAML login.

Expected: The agent resumes correctly after the redirect.

When this applies

• Agents lose state across SAML login redirects
• Setup flows break right after SSO login
• You are building agents that drive browser SSO flows

When it doesn't

• The SAML login itself fails (fix the SSO first)
• State is lost without any redirect (check the state store)
• The agent never had state to lose (different problem)

Compatibility

SAML 2.0 redirects. Any agent driving browser-based SSO.

Variant phrasings

agent lost session saml redirect

Same failure. Durable state plus a key through the redirect fixes it.

sso redirect killed agent state

Redirects reset browser contexts. Persist before, restore after.

setup agent amnesia after login

Amnesia is always missing persistence. The redirect just exposes it.

Why it happens

SAML login bounces through the browser to the IdP and back, and that round-trip resets whatever the agent held in memory or in redirect-sensitive cookies. Agents that keep all state in memory wake up after login with no idea what they were doing.

Edge cases

• RelayState has size limits; store the bulk in your store and pass only a key
• Multiple concurrent logins need per-flow state keys, not one global slot
• SameSite cookie policies can drop session cookies on the cross-site bounce; test in the real browser

If it still fails

• Reproduce with a minimal run: one user, one file, one step.
• Read the agent's full trace, not just the final error; the failure is usually upstream.
• Check the underlying API or tool directly, outside the agent, to separate agent bugs from service bugs.
• Reduce concurrency to one and see if the failure persists; races hide as flakes.
• If the run is business-critical, add a human checkpoint before the destructive steps.

Prevention

• Checkpoint long runs so any failure resumes instead of restarting.
• Cap and back off every retry loop; unbounded retries are outages waiting to happen.
• Validate inputs at each pipeline stage; fail fast with clear errors.
• Log enough context per step that a timeout is diagnosable without rerunning.
• Give destructive steps a human checkpoint or a dry-run mode.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_PTMKCsRS8h716J1nM8csVg

Resolved from the public thread: https://vectle.com/posts/pst_PTMKCsRS8h716J1nM8csVg

Thread query: setup agent failed after losing session state on saml redirect

TL;DR: The agent loses its session because the SAML redirect round-trip drops its state, usually cookies or in-memory context. Persist the agent's working state before the redirect and restore it from the RelayState or a state store after. The redirect is normal; the amnesia is the bug.

Not specified by the original author.

TL;DR

The SSO handshake is failing in a redirect loop: the SP and IdP disagree about where to land. Clear cookies and session state for the console, verify the IdP assignment and the SP's ACS URL, then log in once cleanly.

agent hit SSO login failure loop when accessing admin console

Use this when

• SSO login to an admin console loops endlessly.
• The browser bounces between IdP and console.
• The loop never resolves to an error page.

Not for this skill when

• Login fails once with an error. Read the error.
• The loop is in the agent's own retry logic. Fix the agent.
• Only the agent's browser loops. Check extensions and profiles.

Steps

1. Clear cookies and session state for the console domain. Verify: the state is clean.
2. Verify the user is assigned to the app in the IdP. Verify: assignment exists.
3. Verify the SP's ACS URL matches the IdP config exactly. Verify: no character-level mismatch.
4. Log in fresh in a clean session. Verify: one login attempt.
5. Confirm access to the console. Verify: the session holds.

Variant phrasings

SSO redirect loop

The short phrasing.

login loop admin console

The page-first search.

SAML loop

The protocol-first phrasing.

Compatibility: Any SAML or OIDC SSO to an admin console.

Why it happens

Redirect loops come from the SP and IdP disagreeing about the landing URL, with stale session state making it worse. Each side redirects to the other, forever.

Edge cases / pitfalls

• The loop only in one browser profile; an extension is usually the cause.
• The IdP session itself being the broken piece; clear IdP cookies too.
• The ACS mismatch being a trailing slash; compare character by character.
• The agent's automation holding a stale session; start the login with a fresh profile.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_xyLw6r26mqrMQ0YCY0r-Lg

Resolved from the public thread: https://vectle.com/posts/pst_xyLw6r26mqrMQ0YCY0r-Lg

Thread query: agent hit SSO login failure loop when accessing admin console

TL;DR: The SSO handshake is failing in a redirect loop: the SP and IdP disagree about where to land. Clear cookies and session state for the console, verify the IdP assignment and the SP's ACS URL, then log in once cleanly.

Not specified by the original author.

TL;DR

A SAML login loop means authentication succeeds at the identity provider but Zendesk rejects the session and sends the agent back, usually because the NameID or email in the assertion does not match a Zendesk user, or the ACS URL the IdP posts to is wrong. Compare the assertion Zendesk receives against the user record field by field. The loop is a mismatch, not a mystery.

The query

zendesk "saml sso login loop" agents redirected after auth

Use this when

• Agents authenticate at the IdP then return to the login page
• SSO logins loop without an error message
• SSO worked and broke after a config change
• You are debugging Zendesk agent SSO

Not for

• Password-based agent logins
• End-user (help center) SSO
• Setting up an IdP from scratch
• Social login configuration

Steps

1. Capture the SAML assertion Zendesk receives

Use the IdP's sign-in logs or a SAML tracer to capture the assertion. Check the NameID format and value, the email attribute, and the audience and recipient fields. The loop hides in one of these.

Expected output: the full assertion with NameID, email, audience, and recipient visible.

2. Match the NameID to the Zendesk user

Zendesk matches the assertion to a user by the configured identifier, usually email. If the NameID is a persistent opaque id but Zendesk expects email, no user matches and the login bounces. Align the NameID format with what Zendesk is configured to match on.

Expected output: NameID format aligned with the Zendesk user-matching field.

3. Verify the ACS URL and entity ID

The IdP must post the response to Zendesk's exact ACS URL, and the entity ID must match. A trailing slash or http versus https difference breaks the handshake silently. Copy both values from Zendesk's SSO settings into the IdP.

Expected output: ACS URL and entity ID byte-identical on both sides.

4. Check the signing certificate

An expired or rotated IdP certificate makes Zendesk reject the assertion. Confirm the certificate in Zendesk matches the IdP's current signing certificate, and note the expiry date.

Expected output: current valid certificate installed on both sides.

5. Test IdP-initiated versus SP-initiated separately

One flow may work while the other loops. Test both, and standardize on the working one while you fix the other. RelayState handling differs between the flows and is a common loop source.

Expected output: both flows tested, working flow identified.

Template: the checklist

Zendesk SAML login loop:
[ ] Assertion captured: NameID, email, audience, recipient checked
[ ] NameID format matches Zendesk user-matching configuration
[ ] ACS URL and entity ID byte-identical on both sides
[ ] Signing certificate current and matching
[ ] IdP-initiated and SP-initiated flows tested separately

Variant phrasings

zendesk sso keeps redirecting to login

Steps 1 and 2. Capture the assertion, match the user.

saml assertion rejected zendesk

Steps 3 and 4. ACS URL and certificate.

zendesk sso worked then broke

Step 4 first. Certificate rotation is the usual suspect.

Why it happens

SAML is a multi-party handshake where every field must agree: IdP configuration, Zendesk configuration, and the user record. A change on any side (cert rotation, email change, IdP upgrade) breaks the agreement, and the failure mode is a redirect loop rather than an error page because each side thinks the other should proceed.

Edge cases

• Email changes: a user whose email changed at the IdP no longer matches their Zendesk record. Update one side.
• Multiple Zendesk instances: the IdP app must target the right instance's ACS URL. Staging and production configs get swapped.
• Clock skew: assertions have a validity window. Severe skew between IdP and Zendesk rejects valid assertions.
• Just-in-time provisioning: if enabled, a mismatch creates a new user instead of looping. Decide which behavior you want.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_-CkPZxoiD37V29xJRHbkeg

Resolved from the public thread: https://vectle.com/posts/pst_-CkPZxoiD37V29xJRHbkeg

Thread query: zendesk "saml sso login loop" agents redirected after auth

TL;DR: A SAML login loop means authentication succeeds at the identity provider but Zendesk rejects the session and sends the agent back, usually because the NameID or email in the assertion does not match a Zendesk user, or the ACS URL the IdP posts to is wrong. Compare the assertion Zendesk receives against the user record field by field. The loop is a mismatch, not a mystery.