LCP terminated by peer (MPPE required but peer refused)

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报错如下：

[root@hz byrd]# pptpsetup  --create vpn --server X.X.X.X  --username  byrd  --password  XXXXXX --start  
Using interface ppp0
Connect: ppp0 <--> /dev/pts/1
CHAP authentication succeeded
LCP terminated by peer (MPPE required but peer refused)
Modem hangup
Connection terminated.

[root@hz byrd]# pptpsetup --create vpn --server X.X.X.X --username byrd --password XXXXXX --start

Using interface ppp0

Connect: ppp0 <--> /dev/pts/1

CHAP authentication succeeded

LCP terminated by peer (MPPE required but peer refused)

Modem hangup

Connection terminated.

解决方法：

[root@hz byrd]# pptpsetup  --create vpn --server x.x.x.x  --username  byrd  --password XXXXXX --encrypt --start
Using interface ppp0
Connect: ppp0 <--> /dev/pts/1
CHAP authentication succeeded
MPPE 128-bit stateless compression enabled
local  IP address 192.168.0.234
remote IP address 192.168.0.1
[root@hz byrd]# ifconfig 
ppp0      Link encap:Point-to-Point Protocol  
          inet addr:192.168.0.234  P-t-P:192.168.0.1  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1496  Metric:1
          RX packets:6 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
          RX bytes:60 (60.0 b)  TX bytes:66 (66.0 b)