internal network connection hold

"OpenSSH for Windows" version
8.0.0.0
Server OperatingSystem
Windows Server 2012 R2 Datacenter
Client OperatingSystem
WIN 10
What is failing

use sshj execute command:
DefaultConfig defaultConfig = new DefaultConfig(); SSHClient sshClient = new SSHClient(defaultConfig); sshClient.addHostKeyVerifier(new PromiscuousVerifier()); sshClient.connect(authModel.getHost(), authModel.getPort()); sshClient.authPassword(authModel.getUsername(), authModel.getPassword()); sshClient.setTimeout(15000); try (Session session = sshClient.startSession()) { Session.Command instance = session.exec(command); String result = IOUtils.readFully(instance.getInputStream()).toString(StandardCharsets.ISO_8859_1.name()); result = result + IOUtils.readFully(instance.getErrorStream()).toString(StandardCharsets.ISO_8859_1.name()); textPane.insertMessage(result); }
Expected output
list directory
Actual output
hold

errors****
Server network environment is intranet，when i check server eventviewer openssh log,found only one recode :
sshd: Accepted password for Administrator from 127.0.0.1 port 27656 ssh2
not found Received disconnect info

why sshd accetped password from 127.0.0.1?

i think this is the key to hold

Start with the provided Java sshj connection snippet and the Windows Server 2012 R2 OpenSSH event log entry showing an accepted password from 127.0.0.1. Reproduce the command-hang behavior in the stated client and server environment, then compare the client output and server disconnect events. Done means the cause of the hold is identified and command execution completes or fails with a clear diagnostic.