First, you cd to outgoing, but the directory is Outgoing (capital O). Second, are you sure you start in root directory? I.e. is it really /Outgoing, not something like /home/username/Outgoing? Using relative path cd Outgoing should work in either case.

I successfully log in to the remote site using SFTP and can use the ls command to list the directory contents, which include a number of sub-directories. I can cd to these directories but I can't list their contents. Also, I can't get or put files from/to these directories.
I used mkdir to create a new directory of my own and I can access, list the contents and transfer files OK to/from this new directory.

The winscp thread is as follows. I have dummied out the pasword.
Log file attached.
This operation works fine in the WinSCP GUI.
I also downloaded pUTTY SFTP and had the same issue so I think it is to do with the remote server.

winscp> open sftp://USERNAME:PASSWORD@HOSTNAME/ -hostkey=*
Searching for host...
Connecting to host...
Authenticating...
Using username "eircom-test".
Authenticating with pre-entered password.
Authenticated.
Starting the session...
Reading remote directory...
Session started.
Active session: [1] eircom-test@fileshare-uk.coupahost.com
winscp> ls
Drwxr-xr-x 0 eircom-test 501 111 Mar 19 23:52:04 2014 .
Drwxr-xr-x 0 eircom-test 501 111 Mar 19 23:52:04 2014 ..
Drwxrwxr-x 0 eircom-test 501 94 Oct 30 14:10:03 2013 Outgoing
Drwxrwxr-x 0 eircom-test 501 4096 Mar 20 10:01:19 2014 Incoming
Drwxrwxr-x 0 eircom-test 501 21 Oct 30 14:10:03 2013 Archive
Drwxr-xr-x 0 root root 33 Feb 13 9:30:27 2014 .pids
Drwxrwxrwx 0 root root 4096 Mar 20 9:14:38 2014 .log
-rw-r--r-- 0 root root 348 Feb 13 9:30:13 2014 coupa_load_agent.yml
Drwxr-xr-x 0 eircom-test 501 6 Mar 19 23:52:04 2014 ferg
winscp> cd
/
winscp> cd /outgoing
/outgoing
winscp> ls
Error listing directory '/outgoing'.
No such file or directory.
Error code: 2
Error message from server (en-US): No such file
Request code: 11
(A)bort, (R)etry, (S)kip: Abort
winscp> ls
Error listing directory '/outgoing'.
No such file or directory.
Error code: 2
Error message from server (en-US): No such file
Request code: 11
(A)bort, (R)etry, (S)kip: Abort
winscp> cd/
Unknown command 'cd/'.
winscp> cd
/
winscp> cd /ferg
/ferg
winscp> ls
Drwxr-xr-x 0 eircom-test 501 6 Mar 19 23:52:04 2014 .
Drwxr-xr-x 0 eircom-test 501 111 Mar 19 23:52:04 2014 ..
winscp>