The arcfour256 algorithm fails to be configured with a specific mac algorithm about mina-sshd HOT 6 OPEN

I have tried arcfour128 and other algorithms with higher security to perform connection operation through mina-sshd component, and the connection can be normal now.

When arcfour256 algorithm is used, it is normal to connect the target device directly through the xshell client, but the connection using the mina-sshd component will be abnormal.

When using the arcfour256 algorithm, I switched the openssh version of the target device in the scenario where the mina-sshd component was used to connect to the target device, and neither 5.3 nor 7.4 could be connected properly, nor could the target device in different network segments be connected properly.

When I was debugging, I found that the parameter of the eighth packet was changed to -8, which led to subsequent exceptions.

Could it be that inCipherSize may not work for stream encryption algorithms? (such as arcfour256, also known as RC4), because stream encryption algorithms do not use the block concept.

What is the configuration of mina-sshd or what configuration can I do on the target device to solve it?

from mina-sshd.

No idea. I just tested arcfour128 and arcfour256 against an OpenSSH 7.4 server in CentOS 7.9 (2009), and an Apache MINA SSHD 2.13.0-SNAPSHOT client works just fine. Maybe try the latest release 2.12.1, or the 2.13.0-SNAPSHOT available from the Apache snapshot repositories.

from mina-sshd.

No idea. I just tested arcfour128 and arcfour256 against an OpenSSH 7.4 server in CentOS 7.9 (2009), and an Apache MINA SSHD 2.13.0-SNAPSHOT client works just fine. Maybe try the latest release 2.12.1, or the 2.13.0-SNAPSHOT available from the Apache snapshot repositories.

I tried version 1.21.1 to connect and the problem still exists.
Some other phenomena I have noticed so far:

• Connecting devices on the Intranet will fail, but devices connecting to cloud server vendors can succeed.
• The 1.7.0 version can be used to connect to Intranet devices.

from mina-sshd.