Request Header Or Cookie Too Large

Hi,

Interestingly, all the sites on my server suddenly went away and started giving Request Header Or Cookie Too Large error

proxy:nginx
web:nginx

all site use the php 8.2

nginx.conf

if i change

large_client_header_buffers 4 8k; → 4 16k or 4 32k or 8 64k all site give the host error (cloudflare)

I updated and upgraded the server but not working