Skip to main content

Linux telnet option negotiation - passive

Telnet client that comes with Debian Lenny (Linux Netkit 0.17) or Cygwin 1.7 telnet 1.7 (GNU inetutils) actively initiates option negotiation with the server. This is fine for most cases but there are old servers that just stops sending data when it does not like the option that the client tried to negotiate.

To passively participate in option negotiation, telnet can run with the following argument to force it not to send any further negotiation:
telnet <hostname> <port>
Note here that we specified the port number. By doing so, we are basically telling telnet that negotiation is done and so wait for any packet from the server.

And for old telnet server, the following .telnetrc maybe needed:
DEFAULT set echo mode character set crlf

~ts

Comments

Popular posts from this blog

Error! Could not locate dkms.conf file install VirtualBox 4.1.8 on Ubuntu 11.10

Tried to update my Ubuntu host today and it did pickup that new version of VirtualBox is available (4.1.8). All other packages installed properly except that VirtualBox installation was complaining about missing dkms.conf file, see error message below. $: sudo /etc/init.d/vboxdrv setup * Stopping VirtualBox kernel modules [ OK ] * Uninstalling old VirtualBox DKMS kernel modules Error! Could not locate dkms.conf file. File: does not exist. [ OK ] * Trying to register the VirtualBox kernel modules using DKMS [ OK ] * Starting VirtualBox kernel modules [ OK ] Though it looks like installation was fine but I am concerned about its effects to VirtualBox functionality. To fix this, do: $: cd /var/lib/dkms/vboxhost $: sudo rm -r 4.1.4 $: sudo /etc/init.d/vboxdrv setup Of course you have to re

The following add-ins could not be started MonoDevelop.GnomePlatform

Installing MonoDevelop in OpenSUSE 12.2 from its repository was very easy. When running it for the first time though I got the message: The following add-ins could not be started: The root of the trace shows MonoDevelop.GnomePlatform,2.8 A quick search shows that MonoDevelop depends on libgnomeui . This should have been part of dependencies when installing the application but well.... Below is the screen shot of the error message. References: http://software.1713.n2.nabble.com/MonoDevelop-and-openSUSE-12-1-td7462957.html [2013/04/09] - Same issue observed in OpenSUSE 12.3 and also the same fix. [2014/11/02] - Same issue observed in OpenSUSE 13.3, mondevelop 3.0.6 and the same fix.