406 not acceptable openresty Shutterstock

406 not acceptable openresty Shutterstock, someone asked me to explain?

I m having a contributor account in Shutterstock. I m regularly submitting vector images, But today when I tried to open Shutterstock dashboard I got the following error 

"406 not acceptable openresty"

406 not acceptable openresty

My internet was connected with landline. Afterwards I connected with mobile WIFI network, then also not working. So I used FileZilla and upload images it works. Finally submit content using mobile phone. Everything detail explained in below video.


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