# 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.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.snyk.io/developer-tools/snyk-ide-plugins-and-extensions/troubleshooting-ides/authentication-using-api-token-does-not-work.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.