[BackupPC-users] BackupPC_dump stalls with SIGTTOU on Windows client using rsync

[Mike H. <mi...@vi...>]

Working to add a few Windows clients to our BackupPC system. I have passwordless ssh working and when I try kicking off a backup using the GUI it fails immediately.
Logs show:
2019-08-15 11:09:29 full backup started for directory /cygdrive/c
2019-08-15 11:09:31 Got fatal error during xfer (No files dumped for share /cygdrive/c)
2019-08-15 11:09:36 Backup aborted (No files dumped for share /cygdrive/c)

'BackupPC_dump -f -v <client>' from the command line looks like it's running and the log indicates "full backup started for directory /cygdrive/c" but it hangs there.
Looking at the XFER PIDs I see:
# strace -p 21912
strace: Process 21912 attached
--- stopped by SIGTTOU ---

When I ctrl-c the inactive process these are some of the messages dumped to the screen:
^C^Cexiting after signal INT
__bpc_progress_state__ fail cleanup
BackupFailCleanup: nFilesTotal = 0, type = full, BackupCase = 1, inPlace = 1, lastBkupNum =
Removing empty backup #0
__bpc_progress_state__ delete #0
cmdSystemOrEval: about to system /usr/share/BackupPC/bin/BackupPC_backupDelete -h <hostname> -n 0 -l

BackupPC version: 4.3.1
rsync_bpc: version 3.1.2.0  protocol version 31

Client: Windows Server 2016
Cygwin64:
$ uname -r
3.0.7(0.338/5/3)
openssh 8.0p1-2
rsync 3.1.2-1

Any help appreciated!
Thanks!

--

Mike