I have a 2008 R2 server which runs various FTP downloads from an FTP server on the web. Suddenly the 'FTP get' has got very very slow (0.5 kbps). I've checked all network devices in between the 2008 server and as far as I can the FTP server on the internet. I've tried the FTP from another server in the same VLAN and its fine. I've updated the NIC drivers, checked speed / dulpex settings / AV etc . A network capture shows many 'DUP ACK' and 'TCP Retransmissions' Anyone seen this issue before ? Thanks

Hi Owen_99, Thanks for posting here. So what about the upload performance ? Do you know which FTP software are running on that remote FTP server ? do all computers connect to internet through NAT ? > I've tried the FTP from another server in the same VLAN and its fine. Did you also connect with same FTP account form another host in you network ? Have you consulted with the admin of remote FTP site for checking if they have set any limitation of FTP connection ? AFAIK, some FTP sites will set some policies for restricting connection when source connection meets some conditions, e.g. connection time, maximal connection session number…etc. You may also try reconnecting with restarting this server host and see how is going. Thanks. Tiger Li TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Upload speeds are fine - its juts very slow downloads. I've tried 3 different FTP clients and they are all the same. Yes the server uses NAT to access the internet. FTP from another host in the same VLAN is fine. I've tried restarting the server. Thanks

The main thing that needs to be determined is whether the 'slowness' is caused by the FTP site/service itself, by the server's network layer, or something else altogether located on the network between the client and the FTP server, such as a misbehaving network device. So the first thing you need to do is isolate this away from the FTP server. To do this, capture simultaneous network monitor traces on the client box and the FTP server during one of the slow transfers. Then, check the server-side trace to see if the FTP server is taking too long in responding to packets. If the FTP server is responding appropriately and fast, then you'll know the problem is not with the FTP box and we should focus investigation on the network.Ketan Thakkar | Microsoft Online Community Support