SMTP ssl://smtp.zoho.com:465, timeout=300

I am trying to connect response forms from my Wordpress website, using the Contact Forms 7 plugin, however the SMTP is not working. I have tried using wp-mail-smtp plugin, an assistance plugin for STMP, but it showed a result:

The SMTP debugging output is shown below:

2016-08-16 19:54:30	Connection: opening to ssl://smtp.zoho.com:465, timeout=300, options=array ()
2016-08-16 19:54:31	SMTP ERROR: Failed to connect to server:  (0)
2016-08-16 19:54:31	SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

Any advice would be appreciated, and please correct me if I wrong.. Thanks Before..