Just for informations, you may see “cookies too large” message appears, this is just because our assets are now back on CDN servers, just empty the subdomains cookies for getting rid of the message
Raphaël Jadot
OK, I’ve tested several configs and adding
large_client_header_buffers 4 16k;
In nginx server block resolved the problem without having to empty the 
cache 
Sorry to say, I keep having trouble almost every time trying to enter discourse.
Still getting the cookies error, so every time I have to clear cookies 
It’s not a big problem for me, just wish to be sure that users had not to hit the same.
For me the solution was to recharge the page with shift and press the symbol at the end of adress bar
Not sure if I explain correctly 
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Thanks @jojodu34, but I’m caring mostly about users who may see the error page and don’t know what to do 
So what I’m asking is if it’s related to the temporary/testing engine or it’s an issue we need to solve someway.
Or, it may be just my browser fault… : )
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yes, you’re right to care @rugyada, I have increased again the large headers buffer, can you have a test now?
raphael no change for me I have error 400