---
schema_version: "1"
id: e0f2e60056408f77d034e57bbdfff84aedfb9efc449ca5e3786e2bdc6de81cf8
title: HTTP 404 - File Not Found
collection: tableau
version: current
locale: en-gb
portal_url: https://docs.salesforce.com/tableau/current/en-gb/server/trusted_auth_trouble_404.md
canonical_url: https://help.tableau.com/current/server/en-gb/trusted_auth_trouble_404.htm
source_site: help.tableau.com
content_type: documentation
content_hash: 9f35a0ebf69ab36a7740b2a1c11d2cd4059c367c52671017fceeb4b183876448
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/current/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.