[pptp-server] PopTop w/ MPPE dosen't work with NT4 client?

[Steve Rhodes]

I have tested the folowing patch running an NT client against the PoPToP server
successfully.

ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40/hotfixes-postSP3/pptp3-fix/pptpfixi.exe

It looks like this fix is included in the Service Hack 4 update.


Steve Rhodes wrote:

> I don't have an NT machine to test with, but I suspect that this is an issue
> similar to  what happened with Windows 98.  You have to run an upgrade against
> the machine to get the encryption working.   Seems like the original version of
> PPTP from Microsoft was not implemented properly, and they went through an
> iteration to get it write.  The most promising lead I found on the Microsoft
> site:
>
> http://support.microsoft.com/support/kb/articles/Q167/0/40.ASP
>
> >From the Microsoft site:
>
> "A new historyless mode for encryption and compression over PPTP connections has
> been enabled in this update. This new mode solves performance problems
> encountered using PPTP in high latency networks or networks that experience
> significant packet loss. This upgrade is fully compatible with legacy PPTP
> systems.  However, in order to negotiate historyless mode, both the PPTP client
> and server must support it. If either client or server refuses the new mode,
> normal MPPE compression and encryption will be negotiated. To experience the
> full benefit of the PPTP performance update, this Update must be installed on
> both Windows NTclients and servers. "
>
> Please let us know if you get it working.
>
> water at labj.com wrote:
>
> > Has anybody tried PopTop w/ MPPE against WinNT clients? I tried, but no luck.
> > The connection can be successfully established, but both ends just don't
> > understand the encrypted frames from the other. Any hints to solve this
> > problem? Thanks
> >
> > Jim
> >
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