got error 868 when setting up a pptp vpn server on CentOS

I am setting up a pptp vpn server on a CentOS system. I configured the pptpd service and it's running. Do I need configure the pptp service on all other servers.

Basically, I am following this classic article for this project:  

https://www.digitalocean.com/community/tutorials/how-to-setup-your-own-vpn-with-pptp


[root@nagiosvm ~]# service pptpd status
pptpd (pid  5546) is running...
vpn-error.png
Jason YuAsked:
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Duncan RoeSoftware DeveloperCommented:
Do I need configure the pptp service on all other servers. You mean clients here, don't you? Clients must be able to resolve the server name to an IP address. I would suggest you install a DNS server (e.g. on your VPN server ) and have the client systems use that DNS (you specify the DNS address numerically).
Alternatively, I believe Windows systems do have a hosts file or its equivalent - on each client you could configure the VPN server address therein.
In the client configuration, you may be able to configure the server address in dotted quad notation - that should work straight away.
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