Agent connection aborts with Algorithm negotiation fails error and trace file is created

Document ID : KB000084578
Last Modified Date : 14/04/2018
Show Technical Document Details
Issue:
Error Message :
Caused by: com.uc4.ftpjob.DataTransferException: Connection exception.
at com.uc4.transfer.CITSFTPImpl.(CITSFTPImpl.java:214)
at com.uc4.ftpjob.connections.ConnectionFactory$1.run(ConnectionFactory.java:70)
... 1 more
Caused by: com.jcraft.jsch.JSchException: Algorithm negotiation fail
at com.jcraft.jsch.Session.receive_kexinit(Session.java:583)
at com.jcraft.jsch.Session.connect(Session.java:320)
at com.jcraft.jsch.Session.connect(Session.java:183)
at com.uc4.transfer.CITSFTPImpl.(CITSFTPImpl.java:194)
... 2 more

When upgrading to the Automation Engine (AE) version 12.0.3 and the RA FTP Agent version 4.0.3. the following Error Message is encountered.
 
0EM0N000001hz69.png
and
0EM0N000001hzZV.png
The connection with the SSH key to an external address works from the server via the command line
.
The connection via RA_FTP will start with the below Message and then it aborts and a trace file is created similar to the one shown below.

RA-TRACE:
Caused by: com.jcraft.jsch.JSchException: Algorithm negotiation fail	at com.jcraft.jsch.Session.receive_kexinit(Session.java:583)	at com.jcraft.jsch.Session.connect(Session.java:320)	at com.jcraft.jsch.Session.connect(Session.java:183)	at com.uc4.transfer.CITSFTPImpl.<init>(CITSFTPImpl.java:194)	... 2 more





 
Cause:
Cause type:
Defect
Root Cause: SSH connection fails due to a missing compression algorithm
Resolution:
Update to a fix version listed below or a newer version if available where a zip compression algorithm has now been added to the solution.

Fix Status: Released

Fix Version(s):
RA FTP Solution 4.0.4 - Available
Additional Information:
Workaround :
N/A