On Thu, 29 Jan 2004, Peter Rundle wrote:
> 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;
-- snip --
> 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?
Only that the GRE packets may be blocked elsewhere, ie ISP's have been
known to block. Maybe there's a utility like tcpdump that will show GRE
packets.
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