The system
# cat /etc/issue /etc/redhat-release \S Kernel \r on an \m CentOS Linux release 7.1.1503 (Core)
Install the Extra Packages for Enterprise Linux
# wget http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm # rmp -iv epel-release-7-5.noarch.rpm
Install xrdp from epel and tigervnc-server from base
# yum update # yum install xrdp tigervnc-server # systemctl enable xrdp.service # firewall-cmd --permanent --zone=public --add-port=3389/tcp # firewall-cmd --reload