I have a customer with an ASG120 that keeps having issues with PPTP VPNs. I manage somewhere around 15 total ASG units ranging from 120s to 320s and this is the only time I've ever encountered this problem, and it's a pretty standard configuration.
PPTP VPNs are very inconsisten. Most of the time it just doesn't work. I can connect and get an address, ping the IP of the ASG and even manage it, but traffic doesn't cross to anywhere on the local network. Perfect example of this is earlier this morning I connected the VPN and was actually connected by Remote Desktop to a server, then I just suddently lost connectivity. The VPN was still connected, but I could no longer even ping an internal address. I checked the PPTP Daemon log at the time I lost communication with the server and I see these entries:
2010:08:17-08:46:50 gw01 pptpd[6524]: GRE: buffering packet#130 (expecting #129, lost or reordered)
2010:08:17-08:46:50 gw01 pptpd[6524]: GRE: accepting #130 from queue
2010:08:17-09:24:12 gw01 pptpd[6524]: GRE: buffering packet #747 (expecting #746, lost or reordered)
2010:08:17-09:24:12 gw01 pptpd[6524]: GRE: accepting #747 from queue
2010:08:17-09:24:13 gw01 pptpd[6524]: GRE: buffering packet #785 (expecting #784, lost or reordered)
2010:08:17-09:24:13 gw01 pptpd[6524]: GRE: accepting #785 from queue
2010:08:17-09:26:39 gw01 pppd-pptp[6525]: LCP terminated by peer (=^OsM-/^@
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