[pptp-server] Has anyone seen this error?

[Christopher Tarricone]

Mar 21 15:18:23 chaos pptpd[3837]: CTRL: Client 63.89.28.221 control
connection started
Mar 21 15:18:23 chaos pptpd[3837]: CTRL: Starting call (launching pppd,
opening GRE)
Mar 21 15:18:24 chaos pppd[3838]: The remote system is required to
authenticate itself but I
Mar 21 15:18:24 chaos pppd[3838]: couldn't find any suitable secret
(password) for it to use to do so.
Mar 21 15:18:24 chaos pptpd[3837]: GRE:
read(fd=4,buffer=804d7e0,len=8196) from PTY failed: status = -1 error =
Input/output error
Mar 21 15:18:24 chaos pptpd[3837]: CTRL: PTY read or GRE write failed
(pty,gre)=(4,5)
Mar 21 15:18:24 chaos pptpd[3837]: CTRL: Client 63.89.28.221 control
connection finished