[pptp-server] HELP: PTY read or GRE write failed (pty,gre)=(5,6)

[lutz.niederer at gmx.net]

hello all,

i do have a problem that i saw in lots of postings but without any qualified
answer.
i always get the following error:

Aug  3 13:36:54 sy pptpd[4338]: MGR: Launching /usr/sbin/pptpctrl to handle
client
Aug  3 13:36:54 sy pptpd[4338]: CTRL: local address = 192.168.50.50
Aug  3 13:36:54 sy pptpd[4338]: CTRL: remote address = 192.168.50.51
Aug  3 13:36:54 sy pptpd[4338]: CTRL: pppd options file =
/etc/ppp/options.pptpd
Aug  3 13:36:54 sy pptpd[4338]: CTRL: Client 10.252.201.100 control
connection started
Aug  3 13:36:54 sy pptpd[4338]: CTRL: Received PPTP Control Message (type:
1)
Aug  3 13:36:54 sy pptpd[4338]: CTRL: Made a START CTRL CONN RPLY packet
Aug  3 13:36:54 sy pptpd[4338]: CTRL: I wrote 156 bytes to the client.
Aug  3 13:36:54 sy pptpd[4338]: CTRL: Sent packet to client
Aug  3 13:36:54 sy pptpd[4338]: CTRL: Received PPTP Control Message (type:
7)
Aug  3 13:36:54 sy pptpd[4338]: CTRL: Set parameters to 1525 maxbps, 64
window size
Aug  3 13:36:54 sy pptpd[4338]: CTRL: Made a OUT CALL RPLY packet
Aug  3 13:36:54 sy pptpd[4338]: CTRL: Starting call (launching pppd, opening
GRE)
Aug  3 13:36:54 sy pptpd[4338]: CTRL: pty_fd = 5
Aug  3 13:36:54 sy pptpd[4338]: CTRL: tty_fd = 6
Aug  3 13:36:54 sy pptpd[4338]: CTRL: I wrote 32 bytes to the client.
Aug  3 13:36:54 sy pptpd[4339]: CTRL (PPPD Launcher): Connection speed =
115200
Aug  3 13:36:54 sy pptpd[4338]: CTRL: Sent packet to client
Aug  3 13:36:54 sy pptpd[4339]: CTRL (PPPD Launcher): local address =
192.168.50.50
Aug  3 13:36:54 sy pptpd[4339]: CTRL (PPPD Launcher): remote address =
192.168.50.51
Aug  3 13:36:54 sy pptpd[4338]: GRE: read(fd=5,buffer=804d9c0,len=8196) from
PTY failed: status = -1 error = Input/output error
Aug  3 13:36:54 sy pptpd[4338]: CTRL: PTY read or GRE write failed
(pty,gre)=(5,6)
Aug  3 13:36:54 sy pptpd[4338]: CTRL: Client 10.252.201.100 control
connection finished
Aug  3 13:36:54 sy pptpd[4338]: CTRL: Exiting now
Aug  3 13:36:54 sy pptpd[3791]: MGR: Reaped child 4338

but, i do not have any form of firewalling between the two machines, they
are on the same cable.  i tried to apply the netfilter patch to my rh 2.4.18-5
kernel (& enabled iptables) but i still get the same messages.  poptop and
friends are the lastest i could get.  i used the rpm packages except for the
kernel.  tcpdump showed that it seems to be a problem with gre.  i saw no gre
communication.  but all modules ppp* und ip_gre are loaded (i need to load
them manually even if they are mentioned in modules.conf).  are there any things
i forgot with the kernel?  are there any settings in the conf files i
forgot? ...

any help is really welcome !!

thanks,
L*


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