Hello ! I’m writing here a solution to a problem that rose with the latest updates (april), and I didn’t find a post here or a Github issue yet.
I’m using a Nginx reverse proxy and was getting " Unhandled error response"when login to SOGo and this error in Nginx : upstream sent too big header while reading response header, but no error in all of Mailcow’s logs, and I could get my mails through IMAP.
After a few research I managed to solve this by adding
proxy_buffer_size 128k;
proxy_buffers 4 256k;
proxy_busy_buffers_size 256k;
in location / { and reloading Nginx.
As I’m probably not alone in this case I post it here, tell me if it’s worth creating a Github issue. Maybe to update the documentation ?