FC5做的vpn服务器报错

lksj

用FC5作的服务器，1723口已经打开，但是用windows下的vpn连接后，提示错误800：不能建立VPN连接
察看服务器日志有如下信息

1. Jul  7 11:14:08 vpn pptpd[2723]: CTRL: Client 210.45.176.121 control connection started
   
2. Jul  7 11:14:08 vpn pptpd[2723]: CTRL: Starting call (launching pppd, opening GRE)
   
3. Jul  7 11:14:08 vpn pppd[2724]: In file /etc/ppp/options.pptpd: unrecognized option '-chapms'
   
4. Jul  7 11:14:08 vpn pptpd[2723]: GRE: read(fd=6,buffer=8058640,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs
   
5. Jul  7 11:14:08 vpn pptpd[2723]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7)
   
6. Jul  7 11:14:08 vpn pptpd[2723]: CTRL: Client 210.45.176.121 control connection finished

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我的ppp是系统自带的，内核是2.6.15，所以没有装dkms，请问该如何解决？

1ball

-chapms选项无效，log不是说的很清楚