To allow users to connect to their Linux desktops, the desktops must be able to accept incoming TCP connections from Horizon Client devices, security server, and View Connection Server.
On Ubuntu and Kylin distributions, the iptables firewall is configured by default with an input policy of ACCEPT.
On RHEL and CentOS distributions, where possible, the Horizon Agent installer script configures the iptables firewall with an input policy of ACCEPT.
Make sure that iptables on a RHEL or CentOS guest operating system has an input policy of ACCEPT for new connections from the Blast port, 22443.
When the BSG is enabled, client connections are directed from a Horizon Client device through the BSG on a security server or View Connection Server to the Linux desktop. When the BSG is not enabled, connections are made directly from the Horizon Client device to the Linux desktop.