We're using a self-hosted version of YouTrack 2017.1 (Build 30867)
For two of our users now, (including myself, the administratior), our logins fail with the following error:
> Your authorization token has expired or is invalid. Re-enter your login credentials to refresh the token. If you are still unable to log in, please contact your administrator.
Resetting passwords doesn't fix it, and we've ended up having to delete and re-create users.
What steps should I be taking to diagnose the issue?