[pptp-server] unable to ping hosts on network

Carey Jung carey at itfreedom.com
Sun Oct 17 18:08:16 CDT 1999

This sounds somewhat like a known bug in NT SP5.  Check out Microsoft
knowledge base article Q236584.  Here's an excerpt.  Sound like your

After you upgrade to Windows NT 4.0 Service Pack 5 (SP5), Windows NT
4.0-based 128-bit Remote Access Services (RAS) clients can successfully dial
in to a RAS server, but cannot access the server's network adapter or any
other device on the network. The issue occurs when you are using the Require
Data Encryption option with the Require Microsoft Encrypted Authentication
setting. The client is unable to ping any TCP/IP interface on the remote
network, including the Microsoft Virtual Private Networking Adapter
(NDISWAN) IP address that the server assigned to the client. This behavior
does not occur with 40-bit RAS clients or Microsoft Windows 95/Microsoft
Windows 98 clients.

Routing and Remote Access Services (RRAS) Dial-on-Demand (DOD) connections
that use direct dial (Point-to-Point Protocol, or PPP), not Point-to-Point
Tunneling Protocol (PPTP), are also affected when you are using 128-bit
updates with the Require Data Encryption option with the Require Microsoft
Encrypted Authentication setting

A supported fix that corrects this problem is now available from Microsoft,
but it has not been fully regression tested and should be applied only to
systems experiencing this specific problem. If you are not severely affected
by this specific problem, Microsoft recommends that you wait for the next
Windows NT 4.0 service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support
Services to obtain the fix. For a complete list of Microsoft Product Support
Services phone numbers and information on support costs, please go to the
following address on the World Wide Web:


> -----Original Message-----
> From: pptp-server-admin at lists.schulte.org
> [mailto:pptp-server-admin at lists.schulte.org]On Behalf Of Geoff Nordli
> Sent: Sunday, October 17, 1999 2:59 PM
> To: Pptp-Server List (E-mail)
> Subject: [pptp-server] unable to ping hosts on network
> I have attached my pptplog describing a session.
> I am unable to ping into the network.
> Any ideas why this might happen?
> The proxy arp is eth0, which is the internal
> network (, which I assume is correct,
> since I think it is responsible for replying
> ARP requests on local network.
> I actually had it working temporarily last night,
> but then it broke.
> thanks,
> BTW I am also unable to get the encryption set up
> with the NT 4 SP5 client.  It says,  "the local
> computer does not support encryption".
> Any ideas with that?
> Geoff Nordli

More information about the pptp-server mailing list