> For the complete documentation index, see [llms.txt](https://docs.snyk.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snyk.io/developer-tools/integrations/snyk-ide-plugins-and-extensions/troubleshooting-ides/authentication-using-api-token-does-not-work.md).

# Authentication using API token does not work

If you **get an authentication error after you have seen the message that authentication was successful**, it may help to restrict allowed IP address families to either IPv4 or IPv6, so that requests always come from the same address during authentication.


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