---
schema_version: "1"
id: 248073cb07c093581d61d0248291d068bfabd2ecd02b2e1d539f4e0555a16a47
title: HTTP 401 - Not Authorised
collection: tableau
version: current
locale: en-gb
portal_url: https://docs.salesforce.com/tableau/current/en-gb/server-linux/trusted_auth_trouble_401.md
canonical_url: https://help.tableau.com/current/server-linux/en-gb/trusted_auth_trouble_401.htm
source_site: help.tableau.com
content_type: documentation
content_hash: d81208f332b1aa44981f5e18f67022b3ebcd33fdc8b54a133e8e3fa79c831a42
description: Understand the HTTP 401 Not Authorized error in trusted authentication.
---
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# HTTP 401 - Not Authorised

If you receive a **401 - Not Authorized error**, it could be for one of the following reasons: 

- You may have configured Tableau Server to use Active Directory with SSPI. If your web server uses SSPI, you do not need to set up trusted authentication. You can embed views and your users will have access to them as long as they are licensed Tableau server users and members of your Active Directory. For more information, see [tsm authentication sspi <commands>](https://help.tableau.com/current/server-linux/en-gb/cli_authentication_tsm.htm#TSMSspi).
    
    **Note:** SSPI can only be configured on Tableau Server for Windows.
- Or a **302- Redirect error** after you have deployed Tableau Server, then it's likely the trusted ticket code you have written to construct the URL for the client has not been updated to account for the two-part ticket URL format. For more information, see [Get a Ticket from Tableau Server](https://help.tableau.com/current/server-linux/en-gb/trusted_auth_webrequ.htm).