==== What is the problem?
If I try to login to beta cluster, I see the error message:
```
There seems to be a problem with your login session; this action has been canceled as a precaution against session hijacking. Please resubmit the form.
```
I have tried clearing my cookies, using different browsers, even using Browserstack emulator.
This has occurred so far on https://en.wikipedia.beta.wmflabs.org, https://en.wiktionary.beta.wmflabs.org, https://es.wikibooks.beta.wmflabs.org.
I cannot reproduce this on my local environment, which is the same MediaWiki version as beta.
==== Steps to reproduce problem
1. Go to https://en.wikipedia.beta.wmflabs.org/w/index.php?title=Special:UserLogin
2. Attempt to login
==== Environment
**Browser:** Firefox, Chromium, Safari
**Wiki(s):** MediaWiki 1.36.0-alpha (a01f759) 06:56, 23 September 2020