مشکل ارور ۶۱۹ در vpn

[pesartala2001]

من  روی یک سروریس دهند vps  برنامه vpn pptpd  را نصب کردم به ظاهر همه چیز درست نصب شد ولی اکنون که می خواهم به سرور وصل شوم ارور ۶۱۹ دارم
لاگ برنامه  را هم میگذارم شاید دوستان کمکی کردند

سرور   cent Os 5   نصب هستش



زمان تلاش برای کانکت شدن تو log این هارو میده

Aug 21 03:45:39 server pptpd[24298]: GRE: read(fd=6,buffer=804e560,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs
Aug 21 03:45:39 server pptpd[24298]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7)
Aug 21 03:45:39 server pptpd[24298]: CTRL: Client 78.38.173.190 control connection finished
Aug 21 03:46:29 server pptpd[25614]: CTRL: Client 78.38.173.190 control connection started
Aug 21 03:46:29 server pptpd[25614]: CTRL: Starting call (launching pppd, opening GRE)
Aug 21 03:46:29 server pppd[25615]: Plugin /usr/lib/pptpd/pptpd-logwtmp.so loaded.
Aug 21 03:46:29 server pppd[25615]: This system lacks kernel support for PPP. This could be because the PPP kernel module could not be loaded, or because PPP was not included in the kernel configuration. If PPP was included as a module, try `/sbin/modprobe -v ppp'. If that fails, check that ppp.o exists in /lib/modules/`uname -r`/net. See README.linux file in the ppp distribution for more details.
Aug 21 03:46:29 server pptpd[25614]: GRE: read(fd=6,buffer=804e560,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs
Aug 21 03:46:29 server pptpd[25614]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7)
Aug 21 03:46:29 server pptpd[25614]: CTRL: Client 78.38.173.190 control connection finished