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I've read a bunch of other similar questions, which suggest setting Subsystem sftp internal-sftp in sshd_config, which I did. I am able to connect to my remote machine via SSH normally, but SFTP fails to login. This all started when I set up Duo for 2-factor authentication on my server. When I enter sftp -v HostName corresponding to a host set up in ~/.ssh/config, the terminal hangs waiting for me to approve the login request on my phone. After that, the log prints a bunch of stuff.

The log shows that my key is accepted: Authentication succeeded (publickey)

Then it exits with Exit status 127. Here is the rest of the log output in case it is relevant.

debug1: Authentication succeeded (publickey).
Authenticated to 192.168.1.136 ([192.168.1.136]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: pledge: network
debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0
debug1: Sending environment.
debug1: Sending env LANG = en_US.UTF-8
debug1: Sending subsystem: sftp
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: client_input_channel_req: channel 0 rtype eow@openssh.com reply 0
debug1: channel 0: free: client-session, nchannels 1
debug1: fd 0 clearing O_NONBLOCK
Transferred: sent 2732, received 2572 bytes, in 5.5 seconds
Bytes per second: sent 493.6, received 464.7
debug1: Exit status 127
Connection closed

I would like to reiterate that this process of logging in to SFTP worked perfectly with keys before setting up Duo, but now only SFTP seems to be broken. Any ideas?

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