pptp

Hi all
I'm having problem getting pptpd to accept incoming connections on a
Mandrake 9.1 server. I have set this up on a couple of Suse7.2 servers
and it worked first time but following the same procedure on the
Man9.1 box fails. (I'm using webmin for convenience BTW)

The following output is writen to /var/log/messages

Jan 21 12:33:28 fs01pdc pptpd[25930]: GRE:
read(fd=4,buffer=804d540,len=8196) from PTY failed: status = -1 error
= Input/output error
Jan 21 12:33:28 fs01pdc pptpd[25930]: CTRL: PTY read or GRE write
failed (pty,gre)=(4,5)
Jan 21 12:33:28 fs01pdc pptpd[25930]: CTRL: Client 192.168.0.53
control connection finished
Jan 21 12:33:28 fs01pdc pptpd[25933]: CTRL: Client 192.168.0.53
control connection started
Jan 21 12:33:28 fs01pdc pptpd[25933]: CTRL: Starting call (launching
pppd, opening GRE)
Jan 21 12:33:28 fs01pdc pptpd[25933]: GRE:
read(fd=4,buffer=804d540,len=8196) from PTY failed: status = -1 error
= Input/output error
Jan 21 12:33:28 fs01pdc pptpd[25933]: CTRL: PTY read or GRE write
failed (pty,gre)=(4,5)

Obvously GRE is where the problem lies but I'm not sure what to do
about it.

Thanks in advance

Phil