Sftp fails on OS X Mavericks with broken pipe

Question

I'm (eventually) getting a broken pipe failure when attempting to connect an sftp session to a local Ubuntu Linux host. I can open an ssh session with no problems. I've tried with both password and public key authentication, and this doesn't seem to be the problem (see debug output below).
From an Ubuntu VM running under Fusion on the same Mac I can connect without problems (see second listing below).
Can anyone tell me what the problem is?
Tail of the debug listing for the OS-X session follows:
debug1: Host 'pptablet.local' is known and matches the RSA host key.
debug1: Found key in /Users/ppanish/.ssh/known_hosts:1
debug2: bits set: 515/1024
debug1: ssh_rsa_verify: signature correct
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /Users/ppanish/.ssh/id_rsa (0x7ff23a40bb10),
debug2: key: /Users/ppanish/.ssh/id_dsa (0x0),
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /Users/ppanish/.ssh/id_rsa
debug2: we sent a publickey packet, wait for reply
debug1: Server accepts key: pkalg ssh-rsa blen 279
debug2: input_userauth_pk_ok: fp 6b:75:d3:ab:53:b1:da:fc:56:1c:30:50:30:27:d7:fc
debug1: Authentication succeeded (publickey).
Authenticated to pptablet.local ([fd1c:e6c9:ee1e::21c:7eff:fe05:8921]:22).
debug2: fd 6 setting O_NONBLOCK
debug1: channel 0: new [client-session]
debug2: channel 0: send open
debug1: Requesting [email protected]
debug1: Entering interactive session.
debug2: callback start
debug2: fd 5 setting TCP_NODELAY
debug2: client_session2_setup: id 0
debug1: Sending environment.
debug1: Sending env LANG = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug1: Sending subsystem: sftp
debug2: channel 0: request subsystem confirm 1
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
Write failed: Broken pipe
Connection closed
The following is the end of the debug listing for a successful session from the Ubuntu VM running on the Mac, starting where the OS X implementation fails. Am I correct in thinking that OS X is failing to respond to a negotiation of parameters indicated by the line with asterisks in this listing?:
debug2: channel 0: open confirm rwindow 0 rmax 32768
**debug2: channel 0: rcvd adjust 2097152**
debug2: channel_input_status_confirm: type 99 id 0
debug2: subsystem request accepted on channel 0
debug2: Remote version: 3
debug2: Server supports extension "[email protected]" revision 1
debug2: Server supports extension "[email protected]" revision 2
debug2: Server supports extension "[email protected]" revision 2
debug2: Server supports extension "[email protected]" revision 1
Connected to pptablet.local.

Answer 1

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