[SLUG] Problem with pptpd PoPToP

[Peter Rundle]

Sluggers,

Trying to connect from my Linux desktop to a remote Linux server running 
pptpd fails with
this error in the remote linux servers syslog;

 pptpd[21127]: CTRL: Client 61.95.85.130 control connection started
 pptpd[21127]: CTRL: Starting call (launching pppd, opening GRE)
 pppd[21128]: pppd 2.4.1 started by root, uid 0
 pppd[21128]: Using interface ppp0
 pppd[21128]: Connect: ppp0 <--> /dev/pts/1
 pptpd[21127]: GRE: xmit failed from decaps_hdlc: Operation not permitted
 pptpd[21127]: CTRL: PTY read or GRE write failed (pty,gre)=(5,6)
Google tells me this error is caused by the firewall blocking GRE, so I 
temporarily dropped the
firewall on the remote pptpd server;

 # iptables -L -n
 Chain INPUT (policy ACCEPT)
 target     prot opt source               destination         

 Chain FORWARD (policy ACCEPT)
 target     prot opt source               destination         

 Chain OUTPUT (policy ACCEPT)
 target     prot opt source               destination     
 #

But no joy, I still get the same error.

My desktop can connect to another remote Linux pptpd server no problems, 
and I've compared the
/etc/ppp/pptpd.conf and /etc/ppp/pptpd.options files on the two servers 
and both are the same
(tcpip addresses not withstanding).

Any cluesticks?

Thanks

Pete (not currently subscribed)

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