[Beowulf] 2nd request for ssh connection problem!!

Geoff Galitz geoff at galitz.org
Tue May 29 12:12:13 PDT 2007

Most likely your mail was held up by the moderators as both messages  
just came through.

I'd look at your physical network or switch first.  Have you run  
network stress tests?  Doing a ping flood test between the PC's and  
the head node is a good first step.


On May 28, 2007, at 11:20 PM, Ruhollah Moussavi Baygi wrote:

> -------------------Dear all at Beowulf,
> As I mentioned in my previous email, I have a problem with ssh  
> connection to our Beowulf cluster. I did put an email in Beowulf  
> mailing list group, but with no answer. It is hard to believe that  
> nobody knows anything about this problem, so, I sent this email for  
> the second time. Following please find the content of my previous  
> Best,
> Ruhollah Moussavi Baygi-------------------
> Hi everybody at Beowulf,
> I have a serious problem with ssh connection to our cluster. Every  
> hint/help/suggestion, which can help me to solve it, is highly  
> appreciated.
> Most of the time, when users want to connect and run their programs  
> from their own PCs, the ssh connection failed, especially during  
> transfer files from/to head-node. Our user's PCs are mainly  
> WindowsXP, so they use packages like SSH Secure Shell for  
> connection and file transfer, or Putty for connection and WinSCP  
> for file transfer.
> The error massage is as follows:
> ' Disconnecting: Corrupted MAC on input'
> or
> ' Disconnecting: bad packet length...',   followed by a long integer.
> This problem has practically made our cluster unusable. So, I would  
> be thankful for any coming advice.
> -- 
> Best,
> Ruhollah Moussavi Baygi
> -- 
> Best,
> Ruhollah Moussavi Baygi
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