[Twisted-Python] conch server can't git clone

[Glyph]

I run Conch instead of OpenSSH on my personal server.

I tried to `git clone` a repository on said server, and I saw these logs on the server:

2017-11-06T04:45:49+0000 [twisted.conch.openssh_compat.factory.OpenSSHFactory] disabling non-fixed-group key exchange algorithms because we cannot find moduli file
2017-11-06T04:45:49+0000 [SSHServerTransport,817,1.2.3.4] kex alg, key alg: 'ecdh-sha2-nistp256' 'ecdsa-sha2-nistp256'
2017-11-06T04:45:49+0000 [SSHServerTransport,817,1.2.3.4] outgoing: 'aes128-ctr' 'hmac-sha2-256' 'none'
2017-11-06T04:45:49+0000 [SSHServerTransport,817,1.2.3.4] incoming: 'aes128-ctr' 'hmac-sha2-256' 'none'
2017-11-06T04:45:49+0000 [SSHServerTransport,817,1.2.3.4] NEW KEYS
2017-11-06T04:45:49+0000 [SSHServerTransport,817,1.2.3.4] starting service 'ssh-userauth'
2017-11-06T04:45:49+0000 [SSHService 'ssh-userauth' on SSHServerTransport,817,1.2.3.4] 'user' trying auth 'none'
2017-11-06T04:45:49+0000 [SSHService 'ssh-userauth' on SSHServerTransport,817,1.2.3.4] 'user' trying auth 'publickey'
2017-11-06T04:45:49+0000 [SSHService 'ssh-userauth' on SSHServerTransport,817,1.2.3.4] 'user' trying auth 'publickey'
2017-11-06T04:45:49+0000 [SSHService 'ssh-userauth' on SSHServerTransport,817,1.2.3.4] 'user' authenticated with 'publickey'
2017-11-06T04:45:49+0000 [SSHService 'ssh-userauth' on SSHServerTransport,817,1.2.3.4] starting service 'ssh-connection'
2017-11-06T04:45:49+0000 [SSHService 'ssh-connection' on SSHServerTransport,817,1.2.3.4] got channel 'session' request
2017-11-06T04:45:49+0000 [SSHChannel session (0) on SSHService 'ssh-connection' on SSHServerTransport,817,1.2.3.4] channel open
2017-11-06T04:45:49+0000 [SSHChannel session (0) on SSHService 'ssh-connection' on SSHServerTransport,817,1.2.3.4] unhandled request for env
2017-11-06T04:45:49+0000 [SSHChannel session (0) on SSHService 'ssh-connection' on SSHServerTransport,817,1.2.3.4] executing command "git-upload-pack '/site'"
2017-11-06T04:45:51+0000 [-] sending eof
2017-11-06T04:45:51+0000 [-] exitCode: 0
2017-11-06T04:45:51+0000 [-] sending request 'exit-status'
2017-11-06T04:45:51+0000 [SSHChannel session (0) on SSHService 'ssh-connection' on SSHServerTransport,817,1.2.3.4] sending close 0
2017-11-06T04:45:51+0000 [SSHChannel session (0) on SSHService 'ssh-connection' on SSHServerTransport,817,1.2.3.4] remote close
2017-11-06T04:45:51+0000 [SSHChannel session (0) on SSHService 'ssh-connection' on SSHServerTransport,817,1.2.3.4] shell closed
2017-11-06T04:45:51+0000 [SSHServerTransport,817,1.2.3.4] Got remote error, code 11
	reason: disconnected by user
2017-11-06T04:45:51+0000 [SSHServerTransport,817,1.2.3.4] avatar user logging out (0)
2017-11-06T04:45:51+0000 [SSHServerTransport,817,1.2.3.4] connection lost

And on the client (which is OpenSSH):

$ git clone server:/site WebSite
Cloning into 'WebSite'...
remote: Counting objects: 712, done.
remote: Compressing objects: 100% (528/528), done.
fatal: The remote end hung up unexpectedlyiB | 13.04 MiB/s
fatal: early EOF
fatal: index-pack failed

Anyone have any idea how I could debug this?  My immediate hypothesis is that Conch is treating an EOF / half-close somewhere as a full-close of a session, but I am not sure where to go looking.

-glyph
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