Topic "Host is not communicating for more than 15 seconds."

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See screenshots here:

Trying to run WinSCP.exe from a client server to connect to my company's SFTP. I have successfully done this at 10+ clients, but this client will not work. Normally I simply fill out the "Session" tab information, and can connect. I was getting an error saying "Connection Refused". The client suggested that I try using a proxy, and gave me the information I should need. From the screenshots, you can see that I entered it in with no luck. I don't really even get an error, it just sort of times out.

I tried all different "Proxy Type" options, and none worked.

I am a SQL Server/SSIS/SSRS developer, not a network expert. I have no idea how to dig in and debug this. Any suggestions? Thanks!
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Does their firewall allow outgoing SSH connections at all?
Martin Prikryl

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