[pptp-server] PPTP crypto and management Problems

[Patricia Van Baren]

I had the same problem with my Win98 machines when I tried to add the
encryption support to pppd.  For me, the connection appeared to connect
properly, but no traffic was allowed through the connection.  Installing the
"Microsoft Windows98 Dial-Up Networking Security Upgrade" solved the
problem.

http://support.microsoft.com/support/downloads/DP3268.ASP
or ftp://ftp.microsoft.com/softlib/mslfiles/dun40.exe

They have a knowledge base article about this update at:
http://support.microsoft.com/support/kb/articles/q237/6/91.ASP

> I patched ppp-2.3.8 with the MPPE patch and the RC4 sources from
> OpenSSL-0.9.3a distribution, recompiled the kernel and all the other
> things.
> When I connect to the pptpd linux server with "Require encrypted data"
> option enabled I get a sequence of errors like the ones below (for each
> transmitted packet,I suppose).
> The server works fine with no data encryption.
>
> Jul 19 09:41:00 fw pppd[1517]: Unsupported protocol (0x30d) received
> Jul 19 09:41:00 fw pppd[1517]: sent [LCP ProtRej id=0xe 03 0d df f5 e4
> Jul 19 09:41:00 fw pppd[1517]: rcvd [proto=0x82e7] 22 71 6d 16 1f 9d 3b
> Jul 19 09:41:00 fw pppd[1517]: Unsupported protocol (0x82e7) received
> Jul 19 09:41:00 fw pppd[1517]: sent [LCP ProtRej id=0xf 82 e7 22 71 6d