Error when saving question

I found an error when saving the question as described in the following picture

Hi @doni
You have a WAF or reverse-proxy blocking, so you'll need to fix that. It's not an error in Metabase.

Hi @flamber .. thanks for your answer.. i'll check for that..
but for your info.. if I choose Save as new question it is saved successfully..

@doni Yes, look at the error. Something is blocking PUT requests. When you save a new question, then Metabase use a POST request.