PhantomBuster - Docs (PhantomBuster help center): the official fix for expired/invalid session cookie errors.

## The fix

When a Phantom fails with "Session cookie expired" or login errors, do this:

1. In your browser, manually log out of the target site (LinkedIn, X, etc.) and log right back in.
2. Make sure the PhantomBuster Chrome/Firefox extension is installed; it is how the tool grabs the cookie.
3. On the Phantom's setup page, click the "Connect to..." button and let the extension capture the new active session cookie.
4. Re-run the Phantom.

If it keeps failing right after a fresh cookie, check for local interference: aggressive ad-blockers or privacy extensions can break PhantomBuster's page scripts (disable them one by one), and corporate VPNs/firewalls can route traffic through another country, tripping the site's security on a location mismatch with the cookie.

Thread: docs:phantombuster-session-cookie-fix