AutoSys SCP Job Fails with 'Bad Message' after Agent Upgrade

Products

• Autosys Workload Automation

Issue/Introduction

After upgrading the Autosys System Agent from version 12.0 to 12.1.01 on an AS400 server, users reported that SCP (Secure Copy Protocol) download jobs were failing to complete. 

The ftp_scp_debug.log file shows below message:
======
11/05/2025 12:57:03.354+0800 5 FtpPlugin.SCP Transfer thread for 2851695.10241287_1/WAAE_WF0.1/MAIN.StreamEncoder.implFlush[:309] - 11.05.2025 12:57:03 [  FINER] Outgoing SFTP message at [XX.XX.XX.XX:42489 <-> XX.XX.XX.XX:22]: SshFxpRead {id=1015495, handle=[0, 0, 0, 0], offset=66551283712, length=65536}.

11/05/2025 12:57:03.354+0800 5 FtpPlugin.SFTP Transfer.StreamEncoder.implFlush[:309] - 11.05.2025 12:57:03 [  FINER] Incoming SFTP message at [XX.XX.XX.XX:42489 <-> XX.XX.XX.XX:22]: SshFxpStatus {id=1015463, code=5, message='Bad message', languageTag=''}.

11/05/2025 12:57:03.354+0800 5 FtpPlugin.SCP Transfer thread for 2851695.10241287_1/WAAE_WF0.1/MAIN.StreamEncoder.implFlush[:309] - 11.05.2025 12:57:03 [  FINER] Outgoing SSH message at [XX.XX.XX.XX:42489 <-> XX.XX.XX.XX:22]: SshMsgChannelData {recipientChannel=0, data.length=8192, offset=0, length=29}

11/05/2025 12:57:03.354+0800 5 FtpPlugin.SFTP Transfer.StreamEncoder.implFlush[:309] - 11.05.2025 12:57:03 [  FINER] Incoming SSH message at [XX.XX.XX.XX:42489 <-> XX.XX.XX.XX:22]: SshMsgChannelData {recipientChannel=1, data.length=32, offset=0, length=32}
======

Environment

Agent R12.1.01 in AS400 server 

Resolution

1. Add the below parameters in agentparam.txt file:
ftp.scp.pipelinetransferenable=false
ftp.scp.pipelinewindowsize=8
ftp.scp.downloadblocksize=32750

2. Restart the Agent