We changed the ip on our plesk server in a datacenter migration and now our client is unable to access their sites using ftp from their office. the logs show that the user is authenticated by proftpd but then the operation times out. What can I do? I have validated that they are not using passive ftp and I am able to connect from different offices, just not this one. I have even gone so far as to create a VPN access for the clients at the troubled office to connect to the server and they still have the same problems. How would you trouble shoot this client/server issue?