[pptp-server] Anyone seen this one?

[Joey Coco]

Feb  2 08:13:42 demo pppd[1625]: Couldn't set tty to PPP
discipline: Invalid argument
Feb  2 08:13:42 demo
pptpd[1624]: GRE: read(fd=4,buffer=804d780,len=8196) from PTY
failed: status = -1 error = Input/output error
Feb  2 08:13:42 demo pptpd[1624]: CTRL: PTY read or GRE write failed
(pty,gre)=(4,5)
demo:/var/log#


????