Re: Help understand SSHD server exception "bad length"

[Thomas Wolf <tw...@apache.org>]

On 07.10.22 17:31 , Stefan Müller wrote:
> The SSHD server shows following error while receiving an file:
> 
> [NioProcessor-18] [WARN ] 
> exceptionCaught(ServerSessionImpl[<private/address:port>])[state=Opened]
> 
> IllegalStateException: Bad length (32796) for cmd=SSH_MSG_CHANNEL_DATA - 
> max. allowed=32768
> 
> My first thought is that it is only a warning and I can ignore it. But 
> the received file is empty. After looking at the source code i think it 
> is an error and the client sends too much data.
> 
> Can somebody explain what is going on?

I know this is nearly a year old, but maybe you're still interested. 
We've finally figured it out.

It appears to be a bug in a particular SFTP client. See

* https://github.com/apache/mina-sshd/issues/403
* 
https://community.progress.com/s/question/0D54Q0000ASQm9FSQT/bad-length-32796-for-cmdsshmsgchanneldata-max-allowed32768

Cheers,

   Thomas


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