KB-1567 401 Unauthorized error when attempting to log in via Appian authentication with correct credentials


When attempting to log in to a site via Appian authentication with correct credentials, a 401 error page is shown and the user is unable to log in:

There are no entries logged in the login-audit.csv file for the attempt, no traffic is logged in the application server access log or the webserver access log, and there are no errors in the application server log.


The browser is not correctly forwarding the login request to the application server for processing.


Clear the web browser cache and attempt to log in again.

Affected Versions

This article applies to all versions of Appian.

Last Reviewed: April 2018