All one have to do in Plesk to fix this problem is to add to the open_basedir “:/dev/urandom“. So it looks like this {WEBSPACEROOT}{/}{:}{TMP}{/}:/dev/urandom This entry was posted in PLESK, Symfony3. Bookmark the permalink. Please Post Your Comments & ReviewsYour email address will not be published. Required fields are marked * Save my name, email, and website in this browser for the next time I comment.