Dropbear 2016.71 issue with Bitvise ssh client v7.15

[Naveen Mamindlapalli]

Hi All,

I am running Dropbear v2016.74 SSH server from inetd on uClinux OS
running on ARM cortex M3 processor. When I connected to the SSH server
using Bitvise ssh client v7.15 with option "open SFTP" enabled (by
default) in addition to "Open Terminal" option (by default), the
client successfully connected to the server. The terminal program
(custom CLI, not linux shell) is accessible. I am not doing any sftp
transfers during the session.

After disconnecting the ssh session, I am not able to reconnect again
from Bitvise ssh client. When I debugged further I found that there is
a process "cli -c /usr/libexec/sftp-server" still running in the
background on uClinux Os.

Workaround:
I tried following two options to workaround this issue.

1. kill cli process manually before reconnecting the client again.
This works fine.
2. disable "Open SFTP" option in Bitvise ssh client. This also works
fine & no background sftp process is getting created.

I wanted to know why Dropbear ssh server is not terminating all child
processes when the connection is terminated from bitvise ssh client.
Is this a known issue?

Thanks and Regards,
Naveen