[pptp-server] Encryption Problem

Michael Walter walterm at Gliatech.com
Thu Nov 4 16:16:06 CST 1999

On the 98 clients, in the dial-up properties for the VPN connection:
Have you disabled header compression?
Have you disabled use default gateway on remote network?
Have you disabled Netbeui?
Have you disabled IPX/SPX(You may need this depending on your

Michael J. Walter mcse
Gliatech, Inc.
walterm at gliatech.com
mwalter at drwalter.com

On Thursday, November 04, 1999 5:03 PM, locutus at imsa.edu
[SMTP:locutus at imsa.edu] wrote:
> Hello all.
> I have successfully installed PoPToP 1.0.0 on a RedHat 6.0 (kernel 2.2.5)
> system.  I can connect to it from any 98 host, and can communicate with
> any host on my private network.  However, when I check "require encrypted
> authentication" within the DUN properties on the client, I am no longer
> able to communicate with the private network.  The DUN connection can
> still be established, and the correct IP is assigned, but communication
> is impossible.  I have installed the ppp-mppe patch, recompiled the
> and have loaded all of the necessary modules.  I have also installed
> 0.6.6b.  In addition, I have installed the DUN 4.0 update per the HOWTO.
> This happens from multiple clients, some running 98 and some running 98se.
> None of these have helped.  Here is what I find in /var/log/pptpd.log:
> pppd[1735]: MPPE 40 bit, stateless compression enabled
> pppd[1735]: Script /etc/ppp/ip-up finished (pid 1736), status = 0x0
> pppd[1735]: rcvd [proto=0x4da7] cd 80 08 8a be c6 bc f1 4d 6e ad a5 04 2e
> 91 1f 96 1d b5 3d b0 f4 92 12 0c f9 a6 ce
> pppd[1735]: Unsupported protocol (0x4da7) received
> The last two lines continue, with a different set of numbers in the 
> "unsupported protocol" line, until I disconnect.  Here is my
> lock
> debug
> auth
> +chap
> +chapms
> +chapms-v2
> mppe-40
> mppe-128
> mppe-stateless
> name punk
> require-chap
> proxyarp
> I have run out of ideas.  Any suggestions?
> Thanks in advance.
> Michael Holl
> --
> locutus at imsa.edu
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