Symptom
When accessing CloudBees CD (CloudBees Flow) URL after upgrading to CloudBees CD (CloudBees Flow) version 9.2, attempting to login results in an endless refresh/redirect from the login page to itself.

Workaround
You can work around this issue by cleaning the cookies in your Web Browser.
You can do it following the steps:
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Google Chrome: Clear, enable, and manage cookies in Chrome
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Firefox: [Clear cookies and site data in Firefox](https://support.mozilla.org/en-US/products/firefox)