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

Mikael Lönnroth mikael.lonnroth at advancevpn.com
Thu Nov 22 10:14:26 CST 2001


MessageHi, 

If you add

daemon.debug            /var/log/messages (or some other file)

...to /etc/syslog.conf and then kill -SIGHUP <syslogd process>, you will get more verbose debugging information about what is happening. 

Secondly, you can tcpdump the external port to see if there in fact are GRE packets moving (and in what direction)

Thirdly, you can "ethereal" dump the client to check for GRE traffic there aswell. 

Regards,
Mikael Lönnroth
www.advancevpn.com



----- Original Message ----- 
  From: Mark Burring 
  To: pptp-server at lists.schulte.org 
  Sent: Wednesday, November 21, 2001 9:57 PM
  Subject: [pptp-server] CTRL: PTY read or GRE write failed (pty,gre)=(5,6)



  I have deplyed PopTop so several servers to replace M$ vpn capability (mainly because W2K cannot multihome without dying) and one machine I get these errors:

  Nov 22 13:52:22 perth pptpd[16100]: CTRL: Client ***.***.***.*** control connection started
  Nov 22 13:52:22 perth pptpd[16100]: CTRL: Starting call (launching pppd, opening GRE)
  Nov 22 13:52:22 perth pptpd[16100]: GRE: read(fd=5,buffer=804d8a0,len=8196) from PTY failed: status = -1 error = Input/output error
  Nov 22 13:52:22 perth pptpd[16100]: CTRL: PTY read or GRE write failed (pty,gre)=(5,6)
  Nov 22 13:52:22 perth pptpd[16100]: CTRL: Client ***.***.***.*** control connection finished

  This problem is listed in the FAQ and is caused by it being behind a firewall. However in this case, the machine is not behind a firewall, it is the firewall.

  I have
  1) added entries to the box's firewall to let 1723 and proto 47 through (not that they were being blocked in the first place)
  2) tried flushing the box's firewall rules
  3) tried binding poptop to the external interface

  The only thing of note is that the kernel is patched to Masq pptp however its not being used in this case.


  --
  Regards,

  Mark Burring
  Internetworking Engineer

  Deeptech - Intelligent Networking
  Deepcare - Caring for Your IT Investment
  web: www.deeptech.com.au ; www.deepcareonline.com
  phone: 1300 361 954
  fax: +61 8 9201 2312
  postal: PO BOX 1324, West Perth WA 6872

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