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We run IIS ftp server version 7.5 on Windows Server 2008 R2, and we have some issues:

2013-12-20 21:32:25 24.138.88.64 61397 WS03\xxxx FTPSVC1 WS03 - 172.23.0.86 20 DataChannelOpened - - 0 0 0 0 0 b3466d48-8d22-4bce-9315-30f2ab731800 - -

2013-12-20 21:32:25 24.138.88.64 61397 WS03\xxxx FTPSVC1 WS03 - 172.23.0.86 20 DataChannelClosed - - 0 0 0 6553 0 b3466d48-8d22-4bce-9315-30f2ab731800 - -

2013-12-20 21:32:25 24.138.88.64 61396 WS03\xxxx FTPSVC1 WS03 - 172.23.0.86 21 STOR 222.dat 226 0 0 78 6567 47 b3466d48-8d22-4bce-9315-30f2ab731800 /in/222.dat -

2013-12-20 21:32:25 24.138.88.64 61396 WS03\xxxx FTPSVC1 WS03 - 172.23.0.86 21 ControlChannelClosed - - 0 0 239 85 140 b3466d48-8d22-4bce-9315-30f2ab731800 - -

2013-12-20 21:37:05 24.138.88.64 61380 WS03\xxxx FTPSVC1 WS03 - 172.23.0.86 20 DataChannelClosed - - 258 50 0 2200 0 b556cdbb-9936-457e-8106-a63ac5584c68 - Data+channel+timed+out+due+to+not+meeting+the+minimum+bandwidth+requirement.

2013-12-20 21:37:05 24.138.88.64 61378 WS03\xxxx FTPSVC1 WS03 - 172.23.0.86 21 STOR 221.dat 425 1236 50 54 2214 376524 b556cdbb-9936-457e-8106-a63ac5584c68 /in/221.dat Data+channel+timed+out+due+to+not+meeting+the+minimum+bandwidth+requirement.

2013-12-20 21:37:05 24.138.88.64 61378 WS03\xxxx FTPSVC1 WS03 - 172.23.0.86 21 ControlChannelClosed - - 10053 0 372 143 376664 b556cdbb-9936-457e-8106-a63ac5584c68 - -

the control channel timeout is 30s, the data channel timeout is 30s. the ftp server doesn't use ssl.

As you can see, the second file is not upload and the problem appears when the client connects to our server, uploads one file and try to upload another file after a few minutes. the client use the windows command line FTP.exe.

any idea?

thanks

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