hi,
I've installed ppp-2.4.3-7.rhel4 and pptp-1.7.1-1.fc4 and pptpd-1.3.4-1.rhel4 to create vpn server to server windows clients.
but when I try to connect I always got a 619 error,

this is my /var/log/message content for a connection attempt:

Sep  9 06:29:53 vps111 pptpd[17570]: CTRL: Client 80.71.124.201 control connection started
Sep  9 06:29:53 vps111 pptpd[17570]: CTRL: Starting call (launching pppd, opening GRE)
Sep  9 06:29:53 vps111 pptpd[17570]: GRE: socket() failed
Sep  9 06:29:57 vps111 pppd[17572]: Plugin /usr/lib/pptpd/pptpd-logwtmp.so loaded.
Sep  9 06:29:57 vps111 pppd[17572]: 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.
Sep  9 06:29:57 vps111 pptpd[17570]: GRE: read(fd=6,buffer=804e5a0,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs
Sep  9 06:29:57 vps111 pptpd[17570]: CTRL: PTY read or GRE write failed (pty,gre)=(6,-1)
Sep  9 06:29:57 vps111 pptpd[17570]: CTRL: Client 80.71.124.201 control connection finished


I've tried to install dkms and kernel_ppp_mppe-1.0.2-3dkms but still when I run this command "modprobe ppp-compress-18 && echo ok" I got this error "FATAL: Module ppp_mppe not found."

what can I do to solve this problem?
tnx