400 (bad request) when loading Target

[fern1]

we noticed this morning that we are getting this error: 

when our websites load (it is happening to all of them)

we were debugging some sites yesterday, so we are sure this is new.
And no changes were made in Target´s settings, and Launch.

What can be the cause of this? 

[Gokul_Agiwal · Accepted solution]

Hi @fern1 

This error occurs because you might have missed whitelisting of the site domain. 

Go to Administration > Hosts and whitelist the domain. Also, enable the toggle for Authorized hosts for content delivery.

Here is the help document