I need a free or inexpensive proxy server to connect a satellite facility to the main location, that allows SFTP traffic.

I have a satellite facility connected to the main location by MPLS.  They use a proxy located in the main facility to get to the internet.
We are implementing a new scanning solution that transfers the scans via sftp to an offsite vendor.
The solution works great from the main location, but fails from the satellite.
Out existing proxy is Microsoft ISA Server 2004, which is old, I know.
I am not an expert in this topic, but I am the one that has to take care of.
I cannot redesign the entire network.  We have certain things dictated by our parent company!

Any advice would be appreciated,
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Does all traffic from the satellite office go through the main office and the ISA 2004 server? If that is the case then you need to configure the ISA 2004 server to allow traffic from the remote office to the SFTP server over TCP port 22.

Isn't anyone worried that the software securing your network is 10 years old and that support, including security updates end either in October 2014 (ISA 2004 Standard SP3) or April 2015 (ISA 2004 Enterprise SP3)?

Jackie ManCommented:
RSchalhoubAuthor Commented:
We do not use the ISA Server for security necessarily.  It is basically just to proxy web traffic from other office.
We have a security infrastructure supplied and supported by our parent company
I am going replace this proxy, which brings me to my question here.

I have been told SFTP

Ultimate Tool Kit for Technology Solution Provider

Broken down into practical pointers and step-by-step instructions, the IT Service Excellence Tool Kit delivers expert advice for technology solution providers. Get your free copy now.

Sanga CollinsSystems AdminCommented:
Zentyal server is free and uses linux squid proxy. Very robust and versatile.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Jackie ManCommented:
You need to create a custom protocol definition for the FTPS as shown info in the link below.

Shalom CarmelCTOCommented:
Just my 2 cents:

sftp and ftps are not the same thing.

sftp is really an implementation of ssh, and it does not work well with proxies, particularly so with ISA.
If you can, reconfigure your settings to not route sftp thru ISA.  
Otherwise, use an upload buffer:  place a server in your DMZ ,  upload to it from your application in a supported way, and have a scheduled job that uploads via sftp to the offsite vendor.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.