Windows Server 2008 R2 Thread, FTP Client problems from 2008 r2 box in Technical; Hi there,
Just wondering if anyone can offer any advice i am having with a strange FTP connection problem.
5th May 2011, 04:56 PM #1
5th May 2011, 05:01 PM #2
Is it a site to site VPN or is the server itself initiating the connection?
From the problematic source server can you talk to any other servers on the far end (not using FTP) to confirm the VPN link / route is valid?
If you try from a different source server at Site A can it see the machines at site B that the problematic server cannot?
Are the routing tables the same?
5th May 2011, 05:21 PM #3
1. Capture the traffic on the site firewall and server and see what's happening.
2. Try anonther server from A to B and see if this works (FTP)
6th May 2011, 10:01 AM #4
Can you try ftp Passive mode - sometimes called 'firewall friendly' ?
Have seen similar issues in the past, due to the way ftp works with both a command and a data port.
Sometimes the network connection can be killed as there's no traffic on the command port whilst a data transfer is going.
The hash command can also be useful, by creating extra data on the command port.
6th May 2011, 10:01 AM #5
- Rep Power
Kmount, it is a site to site vpn. The vpn is working fine as we have a number of connections/services running over it with no problems. The connection is fine and staying connected. When i ftp from my desktop (in same subnet to the same devices) it works fine and is stable.
Not sure about the routing tables, but the majority of services across the VPN are working ok so I guess so.
Sukh, I will have a look at capturing the traffic. Other servers/desktops work fine. Ive had the same job running from my desktop overnight and it has been stable
Stumped! Thanks for the tips anyway! Need a sanity check :-)
17th May 2011, 09:43 AM #6
- Rep Power
Just an update as we are making a bit of progress. We managed to get wireshark up and running and captured the information. Whilst this worked we struggled to interpret anything useful from the captured packets.
We tried looking at the patch levels of two win 2008 servers as they were both experiencing the same issues. We patched one of the servers but this still made no difference.
We managed successfully to get the FTP jobs to run without a problem by setting the NIC on the server (within Windows 2008) to 100mb. This works seamlessly now. I have since tried to manually set the switch ports to 1gb and the NIC thinking that it may be an autosensing issue but this failed to work either.
At least I am getting somewhere at long last and I can try and get my FTP off site replication back up and running again. Anyone any ideas? Could it be related to the new networking stack in win 2008 (Although it works fine on a windows 7 desktop going over a 100mb link).
When running the FTP job it always fails between 2:30 and 3:00 minutes after starting at starts to spawn new connections
Last edited by fox1977; 17th May 2011 at 11:43 AM.
23rd May 2011, 11:21 AM #7
- Rep Power
I have since installed SP2 on the box and it hasn't made any difference. If anything it has made it worse! I have also tried it with a different physical network card in the server but this seems to be the same.
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