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about VARIOUS COMMON CONNECTION PROBLEMS:
"Connection closed by remote host."
- you are likely in hosts.deny
- ssh to another host and then to the target machine, then rm yrself from hosts.deny
about FIREWALLD:
firewall-cmd
--get-active-zones
--get-zones
--list-all-zones
--zone=<zone> --list-all
--get-default-zone
--set-default-zone <zone>
--change-interface=<iface> --zone=<zone>
--permanent # MANDATORY if you want your changes to survive thru reboot, except set-default-zone -- that's always permanent
about NETSTAT:
yum install -y net-tools
netstat -tlpn
about VNC:
you can set vnc's $HOME in .vnc/xstartup
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