gptext-upgrade fails with : "Connection closed by remote host"
This error is generally caused by non-optimal network configuration settings:
It is suggested to assess OS configuration settings:
https://techdocs.broadcom.com/us/en/vmware-tanzu/data-solutions/tanzu-greenplum/6/greenplum-database/install_guide-prep_os.html
It is also suggested to run gptext-upgrade again with -P <session numbers> to avoid the ssh connection error.