FTP Client problems from 2008 r2 box
Just wondering if anyone can offer any advice i am having with a strange FTP connection problem.
I have a 2008 r2 server running at one site. This is a backup server and I have a scheduled FTP job setup to transfer backups to another site through a router, over VPN, to an FTP server on another of our sites. All was working on for several weeks and now we are experiencing connection problems with any FTP client from the server (to any FTP server).
Here's what is happening. I am able to connect filezilla to the FTP server and I retreive the directory listing without any problems. I then start to upload any file and after anywhere between 2-4 minutes the connection/speed seems to drop. The speed then starts to crawl and eventually reconnects. The client then reconnects several times before the FTP server states too many connections.
I initially thought this was a firewall issues so carried out a couple of checks. I have checked the firewall rules and all are setup as they were with rules to allow for FTP access through the firewall. So far I have ruled out any isses with the FTP server by connecting to the server from the same site as the FTP server - works ok. I was able to connect to the FTP server ok from a desktop between the two sites. This is what I thought was a little odd as from other machines (win7) the FTP client running across the same site works ok going through the firewall.
I then tried connecting to a second FTP server from one site to another. This didn't work either and indicates an issue with the server. Connecting out to any FTP server (using any FTP client) doesn't seem to want to work. I've disabled the windows firewall on the server but this hasn't made a bit of difference.
As a long shot ive just been and changed the network cable and switch port.
Anyone any ideas on how to trouble shoot this further as I'm running out of ideas.
Thanks in advance