I have a jenkins server which jenkins was upgraded from version 2.220 to 
2.387.1, all plugins have been upgraded.

When I rebuilt jobs, it gave me these output:
Started by user abc
Running as SYSTEM
Building in workspace /var/lib/jenkins/workspace/DEF_GW_ENROLL_USER_PREPROD
[DEF_GW_ENROLL_USER_PREPROD] $ /bin/bash -x /tmp/jenkins81696621479514690.sh
+ export SSH_CONF=/var/lib/jenkins/.ssh/config/ssh_config_preprod-ue1
+ SSH_CONF=/var/lib/jenkins/.ssh/config/ssh_config_preprod-ue1
+ echo PREPROD
PREPROD
+ export targets=batch-host
+ targets=batch-host
+ for host in '$targets'
+ ssh -F /var/lib/jenkins/.ssh/config/ssh_config_preprod-ue1 batch-host 
'sudo python add_user_pastdated.py web.pre.domain.com abc1234 1 
target.internal.domain.com false AUTHSERVER_V1R1 KPREHA_002 8  PST true'
ssh_exchange_identification: Connection closed by remote host
Build step 'Execute shell' marked build as failure
[WS-CLEANUP] Deleting project workspace...[WS-CLEANUP] Skipped based on 
build state FAILURE
Finished: FAILURE

I've tried to do a manual ssh, by copying the config file from 
/var/lib/jenkins/.ssh/config/ssh_config_preprod-ue1 to ~/.ssh/, and then 
run the ssh command, the connection was successfully made, I was able to 
enter the server.

The jenkins.log is empty, and the ssh plugins show no error message, so I 
have no clues at the moment.

What possibly could be the root cause?

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