https://blog.csdn.net/luo200618/article/details/63684662?locationNum=3&fps=1

Linux连接Windows VPN的时候提示

[root@cloud ~]# pptpsetup --create vpn1 --server 192.168.1.2 --username vpn --password vpn --encrypt --start
Using interface ppp0
Connect: ppp0 <--> /dev/pts/1
EAP: unknown authentication type 26; Naking
EAP: peer reports authentication failure
Connection terminated.

解决方法
vi /etc/ppp/options   （不是  options.pptp,被网上到处转的某个文章误导很久 ）

refuse-pap
refuse-eap
refuse-chap
refuse-mschap
require-mppe