Posh-SSH SCP Hangs if SCP is not available on remote system

Start with the Set-SCPFile path and reproduce the upload against a remote *NIX host where scp is unavailable, using the command and timeout values shown. Done means the operation no longer hangs, reports the remote failure, and respects -OperationTimeout; verify that the same command completes when scp is restored.

Not all *NIX hosts come with SCP. We ran into this on a centos box, but there have been others. When SCP is not present on the remote system Posh-SSH SCP hangs. That said, SCP TO a remote device should not be dependant on and SCP client being available ON the remote device (as shown with the pscp example)

Putty fails to SCP, but Posh-SSH hangs if SCP is not available. Effect is shown in step 3 below.

1. rename scp on remote system

[root@rhel-6-32 ~]# mv /usr/bin/scp /usr/bin/_scp

2. show that putty can copy the file

C:\dev>\dev\pscp.exe -v -scp C:\dev\file.pub root@10.0.100.177:/tmp/test.pub
root@10.0.100.177's password:
Server sent command exit status 127
bash: scp: command not found
Fatal: Received unexpected end-of-file from server

3. attempt to SCP the file with Posh-SSH

$SCP=Set-SCPFile -ComputerName $hostobject.computerName -Credential $credentialobject.credential -NoProgress -LocalFile $localFullPath -RemotePath "/tmp/"-Force:$Force  -ConnectionTimeout 6 -OperationTimeout 10 -Verbose -Debug
write-host "Complete"

VERBOSE: Using SSH Username and Password authentication for connection.
VERBOSE: Fingerprint for 10.0.100.177: a2:ce:97:5a:10:7:98:83:d9:9c:6f:2a:fa:9f:2c:42
VERBOSE: Fingerprint matched trusted fingerprint for host 10.0.100.177
VERBOSE: Connection successful
VERBOSE: Uploading C:\dev\file.pub

^^^^ Just hangs there, but also -OperationTimeout appears to be ignored

4. put scp back on the remote system

[root@rhel-6-32 ~]# mv /usr/bin/_scp /usr/bin/scp

5. attempt to SCP the file again

$SCP=Set-SCPFile -ComputerName $hostobject.computerName -Credential $credentialobject.credential -NoProgress -LocalFile $localFullPath -RemotePath "/tmp/"-Force:$Force  -ConnectionTimeout 6 -OperationTimeout 10 -Verbose -Debug
write-host "Complete"

VERBOSE: Using SSH Username and Password authentication for connection.
VERBOSE: Fingerprint for 10.0.100.177: a2:ce:97:5a:10:7:98:83:d9:9c:6f:2a:fa:9f:2c:42
VERBOSE: Fingerprint matched trusted fingerprint for host 10.0.100.177
VERBOSE: Connection successful
VERBOSE: Uploading C:\dev\file.pub
Complete

^^^ completed no problems