FTP Problems

I am having problems with ftp

Our customer is able to login to our site from a unix server but they can't get the file, the process just hangs until they terminate it. The same thing happens if they try a dir, they don't get any data returned.

They can get the file if they do it from a windows pc, through FTP DOS and Internet Explorer

Maybe it could be port translation that is causing the problem ?

Our firewall is open for port 21 only for our ftp server.

Does this ring any bells with anyone ?

Thanks
Steve
stevendunneAsked:
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.

pmarquardtCommented:
What type of firewall are you using?

What FTP server are you using?
0
mrielfCommented:
Try set the PASV mode for transfer
0
stevendunneAuthor Commented:
FTP problems with cust1, cust2 & cust3 ?  Basically they were unable to complete the data connection into our FTP server, the connection just locked up.  I tried all sorts including opening up our firewall for high-ports, ftp ports 20 & 21 for there specific FTP IP addresses.  This still didn't resolve the issue.
 
I found a setting in the firewall which "Forces Inbound & Outbound FTP traffic to default to Port 20".  This then resolved the above problem for these 3 customers.
 
However, this has had a knock on affect with cust4, where we send the file across into there FTP site. The same is now happening here, the data connection is locking up my end when I try to connect.  They are using "Active" FTP which worked fine, before I setup the "Forces Inbound & Outbound FTP traffic to default to Port 20" setting.  However if I remove this setting it will effect cust1, cust2 & cust3.
 
Cust4 are using active ftp, I found these links.........
 
I've even enabled the "H.323 transformation" setting under Dynamic Ports to help with video & more specifically data connections.

Any ideas ?

:-(
 
0
mrielfCommented:
Your cust1,cust2,cust3 are connecting to server behind firewall and they uses PASSIVE metod

Setup your server to accept Passive requests and set a port range for passive connection (example: 40000-49999)

If server resides in DMZ, then check your firewall rules and set these:

Deny    all/all                    from   WAN/*  to   DMZ/*              <-- deny everything from WAN
Allow   tcp/21                   from   WAN/*  to   DMZ/ServerIP    <-- enable only ftp to server
Allow   tcp/40000-49999    from   WAN/*  to   DMZ/ServerIP    <-- enable ftp passive ports to connect
Allow   tcp/20                   from    DMZ/*  to   WAN/*              <-- enable connecting from DMZ (for active ftp connections)

0

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
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
Software Firewalls

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.