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?
Not fully from this description, but I agree that the message indicates
that a client sent a packet larger than the maximum packet size the
server allows on the channel.
What maximum packet size does the client have for this channel (should
be in the SSH_MSG_CHANNEL_OPEN message; if you switch on debug logging,
you should be able to see it).
What client is this? Also Apache MINA sshd, or something else? If not
Apache MINA sshd, there's nothing we can do, and the problem needs to be
fixed in the buggy client.
And what operation is performed exactly? You mention "file upload"...
via SFTP or SCP?
Cheers,
Thomas
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