DRAFT KB-XXXX "Unexpected token < in JSON at position 0" Error

Symptoms

Users who login using SAML occasionally see the following error when navigating around Appian:

This error appears in the following scenarios:

• Users are inactive in Appian for a prolonged period, and the session timeout in Appian and the IdP have different values.
• A user logs out of Appian in one tab while still having Appian open in a second tab. When navigating around the second tab, they see this error.

Other symptoms:

• Refreshing the page causes the error to disappear.
• A network capture will also show the Appian Login page being returned as content.

Cause

The Appian session has timed out, and Appian is pulling the Login Page as HTML, rather then redirecting users to it.

Action

• Refreshing the page will resolve the error.
• There is currently a product enhancement to track this behavior in AN-87093.
• IdP timeout should be the same as Appian Timeout

Affected Versions

This article applies to all versions of Appian.

Last Reviewed: August 2019