[cs615asa] HW1(Message: bochs: cannot connect to X server)

[Joe Letizia]

You should only do that for systems you dont care about/ will not do 
anything private on.

A DNS spoofing/MITM attack is no joke.

I'm a security nut so I would never use that...but for normal people I'm 
sure its okay.

Lets just say you've been warned.

Rob Richard wrote:
> An easy way around the ssh host key warnings is to use the 
> StrictHostKeyChecking option (assuming you are using OpenSSH)
>
> for example:
>
> ssh -o StrictHostKeyChecking=no linux-lab.cs.stevens.edu
>
> -Rob
>
> Joe Letizia wrote:
>> The DNS spoofing is not your fault. It is the linux lab admin's.
>>
>> Try running xclock. that will tell you whether or not youve got 
>> xforawarding going.
>>
>> If you're not using putty + xming, i suggest you do so...unless of 
>> course youre already using a *nix system.
>>
>> Google it, its out there.
>>
>> Shashwath Veerappa Devaru wrote:
>>   
>>> Professor now am facing another problem as seen below when i try to 
>>> ssh with X forwarding
>>>
>>> sveerapp at mechagodzilla:~$ ssh -X linux-lab.cs.stevens-tech.edu 
>>> <http://linux-lab.cs.stevens-tech.edu>
>>> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
>>> @       WARNING: POSSIBLE DNS SPOOFING DETECTED!          @
>>> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
>>> The RSA host key for linux-lab.cs.stevens-tech.edu 
>>> <http://linux-lab.cs.stevens-tech.edu> has changed,
>>> and the key for the according IP address 155.246.89.34
>>> is unknown. This could either mean that
>>> DNS SPOOFING is happening or the IP address for the host
>>> and its host key have changed at the same time.
>>> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
>>> @    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
>>> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
>>> IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
>>> Someone could be eavesdropping on you right now (man-in-the-middle 
>>> attack)!
>>> It is also possible that the RSA host key has just been changed.
>>> The fingerprint for the RSA key sent by the remote host is
>>> 18:14:af:55:11:6e:af:3c:a2:b8:6d:cd:30:6e:85:3a.
>>> Please contact your system administrator.
>>> Add correct host key in /home/sveerapp/.ssh/known_hosts to get rid of 
>>> this message.
>>> Offending key in /home/sveerapp/.ssh/known_hosts:5
>>> RSA host key for linux-lab.cs.stevens-tech.edu 
>>> <http://linux-lab.cs.stevens-tech.edu> has changed and you have 
>>> requested strict checking.
>>> Host key verification failed.
>>>
>>>
>>> I tried on separate hosts but with no luck. Using -Y option also gives 
>>> the same message as above. No am not able to run xterm either, while i 
>>> try to run I get the following error
>>>
>>> sveerapp at neo:~$ xterm
>>> xterm Xt error: Can't open display:
>>> xterm:  DISPLAY is not set
>>>
>>> Kindly Help.
>>>
>>> Thank you,
>>> Shashwath
>>>
>>> On Wed, Feb 18, 2009 at 10:44 PM, Jan Schaumann 
>>> <jschauma at cs.stevens.edu <mailto:jschauma at cs.stevens.edu>> wrote:
>>>
>>>     Shashwath Veerappa Devaru <sveerapp at stevens.edu
>>>     <mailto:sveerapp at stevens.edu>> wrote:
>>>
>>>
>>>     > I did ssh to linux-lab.cs.stevens-tech.edu
>>>     <http://linux-lab.cs.stevens-tech.edu> with X forwarding enabled using
>>>     > the command "ssh -X linux-lab.cs.stevens-tech.edu
>>>     <http://linux-lab.cs.stevens-tech.edu> " .
>>>
>>>     That ought to work.  Is this only happening on a specific host or
>>>     on all
>>>     hosts that linux-lab.cs.stevens-tech.edu
>>>     <http://linux-lab.cs.stevens-tech.edu> maps do?
>>>
>>>     Can you run other applications, such as xterm?
>>>
>>>     Have you tried using '-Y' instead of '-X'?
>>>
>>>     -Jan
>>>
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>>
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