Can't connect to VNC from Windows 10, what could be the reasons?

Question

linux

Hello.
Installed on vps server Centos 6.8.
According to the manuals, I installed a vnc server.
Manual
Everything seems to be as it should, but it does not connect.
With the netstat -nltp command, I see it hangs and listens on port 5091.
In iptables this port 5091 is open.
What else is needed? Please help. Help out linuxoids.
ps A couple of hours earlier I installed the same distribution kit on the same server with the same settings and installed vnc according to the same manual, but as it turned out, I allocated only 20 GB of hard disk space for the OS, and it was decided to rearrange the system by repartitioning the disk.

Answer 1

telnet vncserver.ip 5091
If it doesn't connect, disable the firewall on the server and repeat. So we understand where the rake is - in the firewall or in the vnc server.

Answer 2

1) netstat -lnp - you have already checked (what address is vnc listening to?)
2) iptables --list - check if the rules work (iptables restart may be required)
3) ifconfig - make sure what ip is on the server and whether vnc is listening (or 0.0.0.0)
4) check which ip you are connecting to (ping ip - check for availability)