cannot use save_path in options tab of site specific settings
session.save_path = "tcp://127.0.0.1:6379?weight=1&database=10" session.cache_expire = 1209600 session.save_handler = redis
try adding those values to the options tab.
this resulted in me having two save_path values inside the /etc/php5/fpm/pool.d/web1.conf had to manually correct it by editing the file