WEIRD ftp upload behavior

Hello,

If anyone wants a puzzle, here is one:
This client I have can download FTP perfectly. 80 kBps. BUT his upload behavior is messed up:
It starts at 30 kBps, then goes down in a matter of seconds to 1-2 kbps, and then the data connections just gets disconnected on HIS end. But on the server's end, his data connection is still connected. I'm using Serv-U. He has tried with SmartFTP and ftp.exe

He claims that with other FTP sites this doesn't happen. No customer has ever had a problem like this! I have included his logs at the bottom for inspection if you want.

Strangely, in trace routes, there are big problems with the last hop to his machine, but I don't know who to contact about this, or if this is even the problem exactly:
1 <10 ms <10 ms <10 ms 66.199.141.193
2 <10 ms <10 ms <10 ms tor-dis-2.ne.peer1.net [65.39.198.233]
3 <10 ms <10 ms <10 ms GIG4-0.tor-core-b.peer1.net [216.187.68.69]
4 <10 ms <10 ms <10 ms OC48POS1-0.tor-core-a.peer1.net [216.187.68.229]

5 16 ms 15 ms <10 ms chi-dis-1.ne.peer1.net [216.187.68.58]
6 16 ms <10 ms 15 ms bpr2-ge-5-0-0.ChicagoEquinix.savvis.net [208.174
.225.229]
7 16 ms 15 ms <10 ms bpr1-ae0.ChicagoEquinix.savvis.net [208.174.226.
85]
8 16 ms 15 ms 16 ms cable-and-wireless-peering.ChicagoEquinix.savvis
.net [208.174.226.30]
9 15 ms 16 ms 16 ms cer-core-03.inet.qwest.net [205.171.139.149]
10 31 ms 47 ms 32 ms dca-core-01.inet.qwest.net [205.171.8.165]
11 31 ms 32 ms 46 ms dca-core-03.inet.qwest.net [205.171.9.10]
12 32 ms 31 ms 47 ms 205.171.209.114
13 31 ms 47 ms 31 ms dcx-edge-02.inet.qwest.net [205.171.251.22]
14 31 ms 47 ms 31 ms 208.46.127.254
15 31 ms 47 ms 32 ms so-7-0-0-0.BB-RTR1.RES.verizon-gni.net [130.81.1
0.89]
16 47 ms 31 ms 47 ms so-2-0-0-0.CORE-RTR1.RES.verizon-gni.net [130.81
.9.38]
17 47 ms 31 ms 47 ms A3-0-0-1716.DSL-RTR4.RES.verizon-gni.net [130.81
.11.26]
18 532 ms 453 ms 625 ms pool-138-88-123-43.res.east.verizon.net [138.88.
123.43]

Trace complete.

Here is a log sample from him:

[2] Sun 04Jul04 08:51:41 - (296930) PASV
[6] Sun 04Jul04 08:51:41 - (296930) 227 Entering Passive Mode (216,187,105,220,89,225)
[2] Sun 04Jul04 08:51:41 - (296930) STOR 1972-05-017.pdf
[4] Sun 04Jul04 08:51:41 - (296930) Receiving file c:\clients\gateway\1972-05-017.pdf
[6] Sun 04Jul04 08:51:41 - (296930) 150 Opening BINARY mode data connection for 1972-05-017.pdf.
[2] Sun 04Jul04 08:52:14 - (296909) NOOP
[6] Sun 04Jul04 08:52:14 - (296909) 200 Command okay.
[2] Sun 04Jul04 08:52:32 - (296919) NOOP
[6] Sun 04Jul04 08:52:32 - (296919) 200 Command okay.
[2] Sun 04Jul04 08:52:39 - (296930) TYPE A
[6] Sun 04Jul04 08:52:39 - (296930) 200 Type set to A.
[2] Sun 04Jul04 08:52:39 - (296930) PASV
[6] Sun 04Jul04 08:52:39 - (296930) 227 Entering Passive Mode (216,187,105,220,89,226)
[2] Sun 04Jul04 08:52:40 - (296930) LIST -aLT
[6] Sun 04Jul04 08:52:40 - (296930) 425 Try later, data connection in use.

 

 

 

 

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