I am using redhat 9.0 as a server, and PPTP has been installed. when I use WIN2000 to connect the server (VPN), there is an error:

error 734: The PPP link control protocol was terminated.

what is the problem?

It could be one of many problems. Post your /etc/ppp/options.pptp file.

http://www.microsoft.com/technet/pro...79df2990d.mspx

#file: options.pptpd

name pptpd

# Encryption
# (There have been multiple versions of PPP with encryption support,
# choose with of the following sections you will use.)


# BSD licensed ppp-2.4.2 upstream with MPPE only, kernel module ppp_mppe.o
# {{{
refuse-pap
refuse-chap
refuse-mschap
# Require the peer to authenticate itself using MS-CHAPv2 [Microsoft
# Challenge Handshake Authentication Protocol, Version 2] authentication.
require-mschap-v2
# Require MPPE 128-bit encryption
# (note that MPPE requires the use of MSCHAP-V2 during authentication)
# }}}

proxyarp
lock
nobsdcomp
nologfd
require-mppe-128

Have you selected a secure in the W2K properties?

Check the kernel messages for more information on why the client didn't connect.

#message

Sep 23 13:35:44 SLPDServer pptpd[6160]: CTRL: Client 210.72.9.151 control connection started
Sep 23 13:35:44 SLPDServer pptpd[2410]: MGR: No free connection slots or IPs - no more clients can connect!
Sep 23 13:35:44 SLPDServer pptpd[6160]: CTRL: Starting call (launching pppd, opening GRE)
Sep 23 13:35:44 SLPDServer pppd[6161]: Plugin /usr/lib/pptpd/pptpd-logwtmp.so loaded.
Sep 23 13:35:44 SLPDServer kernel: application bug: pppd(6161) has SIGCHLD set to SIG_IGN but calls wait().
Sep 23 13:35:44 SLPDServer kernel: (see the NOTES section of 'man 2 wait'). Workaround activated.
Sep 23 13:35:44 SLPDServer pppd[6161]: pppd 2.4.3 started by root, uid 0
Sep 23 13:35:44 SLPDServer pppd[6161]: Using interface ppp0
Sep 23 13:35:44 SLPDServer pppd[6161]: Connect: ppp0 <--> /dev/pts/0
Sep 23 13:35:44 SLPDServer pptpd[6160]: CTRL: Ignored a SET LINK INFO packet with real ACCMs!
Sep 23 13:35:44 SLPDServer modprobe: modprobe: Can't locate module ppp-compress-18
Sep 23 13:35:44 SLPDServer pppd[6161]: MPPE required, but kernel has no support.
Sep 23 13:35:44 SLPDServer pppd[6161]: Modem hangup
Sep 23 13:35:44 SLPDServer pppd[6161]: Connection terminated.
Sep 23 13:35:44 SLPDServer pppd[6161]: Connect time 0.0 minutes.
Sep 23 13:35:44 SLPDServer pppd[6161]: Sent 0 bytes, received 44 bytes.
Sep 23 13:35:44 SLPDServer /etc/hotplug/net.agent: NET unregister event not supported
Sep 23 13:35:44 SLPDServer pppd[6161]: Exit.
Sep 23 13:35:44 SLPDServer pptpd[6160]: CTRL: Client 210.72.9.151 control connection finished

what is the meaning? I just use the default settings of W2K.

You need to build and install MPPE for your kernel. Follow 1 a,b,c,d here and then try again:
http://pptpclient.sourceforge.net/howto-redhat-90.phtml

I have installed MPPE, but still can not find the module. how to install it?

thanks, the problem was solved. a wrong version file was used.

BTW, now I can log on the VPN server, but I can not use connect samba server from W2K, and I can not connect to other competers in the LAN.

how to config? are they possible?

In pptpd.conf are remoteip and localip different but in the same subnet?
Have you enabled ip forwarding?

From http://home.swbell.net/berzerke/howto.html#gotchas
6.2 Remote and Local IPs
In your pptpd.conf file, be sure the remoteip(s) and localip (you don't need more than one) are on the same subnet and do *NOT* overlap. They must be different. Also, be sure any ip's specified in chaps-secrets do not overlap either.

6.4 Forwarding
You're going to have lots of trouble unless you enable ip forwarding. The command [echo "1" >/proc/sys/net/ipv4/ip_forward] will do it, but will not survive a reboot, so be sure and place the command somewhere in your startup scripts. Also, if you have a firewall, be sure it allows the forwarded packets through.