I've fixed certificate the problem was that you tried  to switch to own domain but you didn't add DNS record for chat subdomain. 

Please note that now your site generate DB error related to modzzz recipe module:

Database query error
Query: SELECT `id`, ``, FROM_UNIXTIME(``)  FROM `mz_recipe_entries` WHERE `` > `added` AND `status` = 'awaiting'
Mysql error: Unknown column '' in 'field list'