Problem solved. It was nothing related to zimbra. When working directly on the zimbra interface ( normal one is proxied ) everything was working like expected.
In the nginx error log appeared:
[error] 1680#0: *461112 client intended to send too large body: 2632937 bytes, client: <ip>, server: <server>, request: "POST /service/upload?fmt=extended HTTP/1.1", host: "<host>", referrer: "http://<server>/zimbra/"
Solution was to add:
client_max_body_size 50M;
in the 'server' directive of the nginx configuration. |