[mng@lixx-63 ~]# /usr/local/psa/bin/http2_pref enable
WARNING: You are using a custom virtual host template(/usr/local/psa/admin/conf/templates/custom/domain/nginxDomainVirtualHost.php)
This may cause issues with enabling HTTP/2 support for domains.
nginx1.9.14-centos6.16040615
OS CentOS 6.7...