How is that problem related to VisualEditor (which you set as a product here)?
I don't see VisualEditor mentioned in your steps to reproduce?
Also, URLs to reproduce the problem are welcome.

Also, URLs to reproduce the problem are welcome.

http://login.wikimedia.beta.wmflabs.org/wiki/Special:CentralLogin/start?token=bbdd420df13bbf427dba8b3a38d6f947

(In reply to Ritu Swain from comment #2)

Also, URLs to reproduce the problem are welcome.

I followed this link http://en.wikipedia.beta.wmflabs.org/wiki/User:Swainr?veaction=edit

and clicked on Log in.After entering id and password in the page when I click on log in button it takes me to this page
http://login.wikimedia.beta.wmflabs.org/wiki/Special:CentralLogin/

start?token=bbdd420df13bbf427dba8b3a38d6f947 .

I can confirm comment 3, same outcome here, simply because http://login.wikimedia.beta.wmflabs.org/wiki/Special:CentralLogin/start does not exist.

This feels unrelated to VE, hence correcting product/component.

Raising priority (and changed summary) since most Flow browser tests are failing.

Login through the API may be working.

http://login.wikimedia.beta.wmflabs.org/ is entirely down. Normally there is a whole wiki there (albeit one normally used only for login).

Another example of why beta shouldn't have a diverged apache config from production.

Docroot paths fixed in https://gerrit.wikimedia.org/r/165649

Puppet force run on deployment-mediawiki0[1-3], apache and hhvm restarted.

WFM now :)