Forbidden message, file upload doesn't work

Hello everyone,
i have problems with my owncloud installation.
Server: Ubuntu 14, owncloud 9.1.1, ssl active
I can upload files like a 10mb jpeg or a 2mb zip file. But i am not able to upload a 7mb zip file. owncloud message: error while uploading "":Forbidden

Anyone an idea what i hav made wrong? Maybe a timeout problem?

Thanks a lot


most likely some limitation / wrong configuration on server side (mod_security, Cloudflare, ...). We have a FAQ thread available here describing all known info about such upload issues over a certain file size: