OR YOU CAN
1) run this commands:
#apt-get install python-pip
#pip install passlib
source: http://support.ajenti.org/topic/222149-need-to-pip-install-passlib/
2) in /etc/ajenti/config.json i changed
"bind":{"host":"0.0.0.0", "port" : 8000}
to this
"bind":{"host":"my_server_ip_address", "port" : 8000}
3) restart ajenti service
4) access ajenti with following address
https://my_servera_ip_address:8000

I have done following steps in ubuntu 14.04 server LTS, i can now access the panel.
1) run this commands:
#apt-get install python-pip
#pip install passlib
source: http://support.ajenti.org/topic/222149-need-to-pip-install-passlib/
2) in /etc/ajenti/config.json i changed
"SSL":{ enabled:true, ... }
to this
"SSL":{enabled:false, ...}
3) restart ajenti service
4) access ajenti with following address
http://my_servera_ip_address:8000