Well... I have exactly the same problem - during uploads, Im constantly disconnected with this "no new data for 900 seconds" message, but after 40-50 seconds (!!!!).
To tell the truth, I have the strong feeling this is a FlashFXP (3.2.0 build 1080) issue, because if I use the Total Commander FTP for upload to the same server, it works perfectly. So it cant be the problem of my internet connection nor my firewall settings nor misconfiguration in the ftp server. Maybe something is incompatible with the ftp servers...
Downloads are OK, but the upload....
Tried active/passive mode, send noop during transfer but nothing helps.
Here is the log, but I think it gives no new information....
WinSock 2.0 -- OpenSSL 0.9.7g 11 Apr 2005
[R] Connecting to Extra2 -> DNS=ftp.extra.hu IP=80.77.113.44 PORT=21
[R] Connected to Extra2
[R] 220-FTP server ready.
[R] 220 This is a private system - No anonymous login
[R] USER Kovacs24Bela
[R] 331 User Kovacs24Bela OK. Password required
[R] PASS (hidden)
[R] 230-Your bandwidth usage is restricted
[R] 230-User Kovacs24Bela has group access to: Kovacs24
[R] 230-OK. Current restricted directory is /
[R] 230-201 files used (0%) - authorized: 100000 files
[R] 230 163763 Kbytes used (15%) - authorized: 1048576 Kb
[R] SYST
[R] 215 UNIX Type: L8
[R] FEAT
[R] 211-Extensions supported:
[R] EPRT
[R] IDLE
[R] MDTM
[R] SIZE
[R] REST STREAM
[R] MLST type*;size*;sizd*;modify*;UNIX.mode*;UNIX.uid*;UNI X.gid*;unique*;
[R] MLSD
[R] ESTP
[R] PASV
[R] EPSV
[R] SPSV
[R] ESTA
[R] AUTH TLS
[R] PBSZ
[R] PROT
[R] 211 End.
[R] CWD /wwwroot/tvrip/
[R] 250 OK. Current directory is /wwwroot/tvrip
[R] PWD
[R] 257 "/wwwroot/tvrip" is your current location
[R] TYPE A
[R] 200 TYPE is now ASCII
[R] PASV
[R] 227 Entering Passive Mode (80,77,113,44,133,53)
[R] Opening data connection IP: 80.77.113.44 PORT: 34101
[R] LIST -al
[R] 150 Accepted data connection
[R] 226-Options: -a -l
[R] 226 3 matches total
[R] List Complete: 224 bytes in 0,46 seconds (0,5 KB/s)
[R] TYPE I
[R] 200 TYPE is now 8-bit binary
[R] PASV
[R] 227 Entering Passive Mode (80,77,113,44,134,128)
[R] Opening data connection IP: 80.77.113.44 PORT: 34432
[R] REST 112820352
[R] 350 Restarting at 112820352
[R] STOR Igenis,_miniszterelnok_ur!_12_Erdekes_ellentetek.a vi
[R] 150 Accepted data connection
[R] 421 Timeout (no new data for 600 seconds)
[R] Connection lost: Extra2
[R] Transfer Failed!
[R] Attempting to Reconnect.
[R] Connecting to Extra2 -> DNS=ftp.extra.hu IP=80.77.113.44 PORT=21 (attempt # 1)