# Troubleshoot problems signing in
Here are some things you can try if you’re having trouble signing in to Cognite Data Fusion (CDF).
# Restart the browser
A previous signed in session may still be active. To reset the browser, quit and restart the browser. Then navigate to fusion.cognite.com/ (opens new window) to sign in.
# Clear the browser cache
The browser may have cached an older version of the application. To force a new version to be loaded:
- Navigate to fusion.cognite.com (opens new window).
- Reload the current page, ignoring cached content:
- Windows: Ctrl + Shift + R
- macOS: Cmd + Shift + R
- Sign in.
# Clear browser cookies
Sometimes the cookies set by the identity provider (for example, Microsoft, Google) are stale, corrupted, or cannot be read. Follow the steps for your browser to clear cookies:
- Google Chrome (opens new window)
- Safari (opens new window)
- Edge (opens new window)
# Contact support
If you are still unable to sign in, contact firstname.lastname@example.org for help.