When I connect to ASG 7.004 from WinXP SP2, PPTP is rock solid.
Under Vista I can connect but the link dies after various amounts of time. This is what I'm seeing in the PPTPD logs for example:
2007:05:17-11:41:07 fw0 pppd-pptp[27449]: Starting negotiation on /dev/ttyp0
2007:05:17-11:41:07 fw0 pptpd[27448]: GRE: Bad checksum from pppd.
2007:05:17-11:41:07 fw0 pptpd[27448]: CTRL: Ignored a SET LINK INFO packet with real ACCMs!
2007:05:17-11:41:09 fw0 pppd-pptp[27449]: Using interface ppp0
2007:05:17-11:41:10 fw0 pppd-pptp[27449]: MPPC/MPPE 128-bit stateless compression enabled
2007:05:17-11:41:10 fw0 pppd-pptp[27449]: Cannot determine ethernet address for proxy ARP
2007:05:17-11:41:10 fw0 pppd-pptp[27449]: local IP address 10.242.1.1
2007:05:17-11:41:10 fw0 pppd-pptp[27449]: remote IP address 10.242.1.2
2007:05:17-11:41:10 fw0 pppd-pptp[27453]: id="2201" severity="info" sys="SecureNet" sub="vpn" event="Connection started" username="firedaemon" variant="pptp" srcip="86.6.15.98" virtual_ip="10.242.1.2"
2007:05:17-11:41:40 fw0 pptpd[27448]: GRE: buffering packet #320 (expecting #322, lost or reordered)
2007:05:17-11:41:41 fw0 pptpd[27448]: GRE: timeout waiting for -28 packets
2007:05:17-11:41:41 fw0 pptpd[27448]: GRE: accepting #320 from queue
2007:05:17-11:42:59 fw0 pppd-pptp[27449]: LCP terminated by peer (+M-^J2#^@
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