Broken ftp client problem

[sfgroups]

We are transferring data from HPUX 11.11 FTP Server (PHNE_33412) to Solaris 8 server using WAN connection.
When we try to get a file (size > 50 MB), the client side of the ftp
connection hangs at the end of the transfer (the file is completely
transfered). We are able to transfer small size files.
I think its problem with HPUX ftp server side, but Server admin telling no problem with that server.

Any help to resolve this problem?
Thanks
-SR

[Sundar_7]

Most likely he is correct. The problem is most cases is the firewall rule.

Check with your firewall team and have them review the logs.

If needed, plug in a sniffer and initiate the transfer.

FTP uses two ports one for data and one for control. When the data is being transferred, control port remains idle. It is possible that some firewalls treat this as an idle connection and disconnects the control port connect after the predefined timeout value, which could be causing the hang.

[Bill Hassell]

Are either of the network connections using a NAT router? This is a common problem with inexpensive (home) routers but there does not seem to be a fix. Make sure you run the transfer in PASSIVE mode.

[sfgroups]

Hi,

I tried passive mode ftp file transfer, still same behavior.

Which side we need to monitor the network on server side or client side?

Thanks

[Reshma Malusare]

Hi,
I am agree with what "sundar" said.
If its transferring small files then it will transfer large files too. but there is possiblity that there is some issue with firewall.. First check with it on both sides server as well as client.

[Bill Hassell]

Get a copy of Wireshark for a PC and connect it to the network with a hub (not a switch port). Then trace the transactions between the two IP addresses. Then look at the end of the trace to see the transaction failures.