Re: Failing to connect to an openSSH server

[Aris Adamantiadis <aris@xxxxxxxxxxxx>]

Hi Jeroen,

Thanks for your report (and the precious log!).
Does this problem happen everytime you connect ? Does it happens on all
servers or only this one ?
I can see it's OpenSSH 4.3. Is it a custom compile ? On which distro
does the server run ?

I see from your log that you're using threads_pthread. Is your client
tool multithreaded ?
There seems to be a problem with the generation or the sending of the
diffie-hellman bignum. This can come from a non-handled error somewhere
(we do not detect our invalid DH parameter) and has a source (maybe a
problem with the initialization of openssl/libgcrypt).

Could you provide me a copy of your libssh-0.5.0/build/CMakeCache.txt
file and tell me more about your build environment ? (distribution,
maybe a few lines of code, especially initialization of libssh).

Thanks,

Aris

Le 8/09/11 11:09, Jeroen Pot a écrit :
> Hi All,
> 
>  
> 
> When I try to connect to an openSSH server I get the following error:
> 
> Error : Received SSH_MSG_DISCONNECT: 33554432:bad client public DH value
> (Full logging attached)
> 
>  
> 
> It seems that the server forces a disconnect.
> 
> The sshd reports:
> 
> /invalid public DH value (1/1024)/
> 
> /Disconnecting: bad client public DH value /
> 
>  
> 
> Question is: What causes this  disconnect and how can I fix this?
> 
> When I connect using the openSSH ssh client I have no problems.
> 
> Any help with this problem is very  much appreciated.
> 
>  
> 
> Regards,
> 
>  
> 
>  
> 
> Jeroen Pot
> 
> /Senior Software Engineer/
> 
>  
> 
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