---
schema_version: "1"
id: 37c5410359fc356fb257764f4e968fe4215c527953d994c12cf4ae216d90df7b
title: HTTP 404 - File Not Found
collection: tableau
version: next
locale: en-gb
portal_url: https://docs.salesforce.com/tableau/next/en-gb/server/trusted_auth_trouble_404.md
canonical_url: https://help.tableau.com/v0.0/server/en-gb/trusted_auth_trouble_404.htm
source_site: help.tableau.com
content_type: documentation
content_hash: d477f8fad0a67228a08510edaabc5786e4c6fb5342d9e66e407e91c3484bdd85
description: Understand the HTTP 404 File Not Found error in trusted authentication.
---
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# HTTP 404 - File Not Found

You may receive this error if your program code references a Tableau Server URL that does not exist. For example, your web server may construct an invalid URL that cannot be found when the webpage tries to retrieve it.

Another cause for this error is if you did not enter the trusted web servers as specified in [Add Trusted IP Addresses or Host Names to Tableau Server](https://help.tableau.com/v0.0/server/en-gb/trusted_auth_trustIP.htm). If you have already entered the trusted web servers, verify that the IP addresses or host names are correct.