--- title: "Error: \"Auth0 request failed\" / Code 500" description: ""Initiating the Auth0 authentication process failed with the following error: "Code 500"\n\nPlease contact our support team for assistance"" --- [Skip to content](https://support.testfit.io/knowledge/troubleshooting/error-auth0-request-failed#main-content) [![](https://support.testfit.io/hs-fs/hubfs/primary%20wordmark.png?width=150&height=113&name=primary%20wordmark.png)](https://testfit.io/?hsLang=en) Open main navigation Close main navigation - - [Contact us](https://support.testfit.io/knowledge/kb-tickets/new) [Contact us](https://support.testfit.io/knowledge/kb-tickets/new?hsLang=en) Welcome to the TestFit Knowledge Base - There are no suggestions because the search field is empty. 1. [TestFit Knowledge Base](https://support.testfit.io/knowledge?hsLang=en) 2. [Troubleshooting](https://support.testfit.io/knowledge/troubleshooting?hsLang=en) 3. [Errors](https://support.testfit.io/knowledge/troubleshooting?hsLang=en#errors) February 3, 2025 # Error: "Auth0 request failed" / Code 500 ## "Initiating the Auth0 authentication process failed with the following error: "Code 500" Please contact our support team for assistance" --- ### Issue When logging into the TestFit application you get the following error: ***"Auth0 request failed*** ***Initiating the Auth0 authentication process failed with the following error: "Code 500"*** ***Please contact our support team for assistance"*** ![image-Aug-01-2023-05-35-19-9270-PM (1)](https://support.testfit.io/hs-fs/hubfs/CS%20-%20Customer%20Success/CS%20-%20Knowledge%20Base/CS%20-%20Knowledge%20Base/Troubleshooting/image-Aug-01-2023-05-35-19-9270-PM%20(1).png?width=682&height=195&name=image-Aug-01-2023-05-35-19-9270-PM%20(1).png) ***![IMG_20240105_081647](https://support.testfit.io/hs-fs/hubfs/CS%20-%20Customer%20Success/CS%20-%20Knowledge%20Base/CS%20-%20Knowledge%20Base/Troubleshooting/IMG_20240105_081647.jpg?width=688&height=691&name=IMG_20240105_081647.jpg)*** --- ### Cause Generally this error is due to a communication issue between the workstation and our services. --- ### Solution The following domains should be whitelisted to ensure license checks and software updates work properly: - 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