Unable to Connect to Dropbear SSH Server

[sansjtw1]

Unable to Connect to Dropbear SSH Server

I am facing an issue where the Dropbear SSH server does not permit client connections, despite the absence of errors in the logs.

Server Output:

$ ./dropbear -F -r /data/data/com.package/anopenssh/key/dropbear_rsa_key -p 22441 -s
[16624] Sep 21 08:27:26 Not backgrounding
[16672] Sep 21 08:27:35 Child connection from 127.0.0.1:51600

Client Output:

$ ssh -p 22441 u0_a1033@0.0.0.0
The authenticity of host '[0.0.0.0]:22441 ([0.0.0.0]:22441)' can't be established.
RSA key fingerprint is SHA256:ZcdNEwL9vtVVPfOa1r26znukBFzaOFR/3xSbMUvcWMk.
This key is not known by any other names.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '[0.0.0.0]:22441' (RSA) to the list of known hosts.
Connection closed by 127.0.0.1 port 22441

Environment:

• Dropbear version: v2024.85
• Operating System: Android 10 (rootless)
• kernel version: Liunx 4.14.141+
• Compilation environment: Termux (rootless)
• Server: Android terminal emulator (rootless)
• Client: Android Termux (rootless)

Steps to Reproduce:

1. Start Dropbear server with the command: ./dropbear -F -r /data/data/com.package/anopenssh/key/dropbear_rsa_key -p 22441 -s
2. Attempt to connect from the client using: ssh -p 22441 u0_a1033@0.0.0.0

Expected Behavior: The client should successfully connect to the Dropbear server.

Actual Behavior: The connection is immediately closed after authentication.