Cannot connect to host via command line but can through GUI

I am attempting to open a connection to a host via the command line but the connection never completes. It eventually times out and aborts. If I use the same connection parameters via the GUI application the connection works fine. What could the possible cause of this be?

Below is what I get when I use this syntax
winscp.com /command "open username:password@servername:port"

Searching for host...
Connecting to host...
Host is not communicating for more than 15 seconds. Still waiting...
Warning: Aborting this operation will close connection!
<A>bort:Abort
Terminated by user.
winscp> exit

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