I have four computers on a network:
- - A W2k3 32 bits computer with a NAT configured using RRAS (let´s call it NAT)
- A Windows XP computer (let´s call it A)
- A W2k3 64 bits server (let´s call it B)
- A W2k3 32 bits server (let´s call it C)
The NAT also forwards the connections comming from an external IP Y, ports 80 and 443 to server C.
I have this 425 error after the LIST command when I try to connect to a certain FTP Server using ONLY server B. The client is correctly configured to use passive mode.
The firewalls on all these machines are turned off. The NAT machine use the basic firewall of the RRAS. All the threee machines use the NAT as the default gateway.
Follows the log for the converstation obtained with Network Monitor
2 0.000000 NetworkInfoEx NetworkInfoEx: Network info for MEDIADNASRV3, Network Adapter Count = 1
3 5.031250 192.168.2.33 200.XXX.YYY.ZZ TCP TCP: Flags=.S......, SrcPort=4675, DstPort=FTP control(21), Len=0, Seq=4012585495, Ack=0, Win=65535 (scale factor not found)
4 5.031250 200.XXX.YYY.ZZ 192.168.2.33 TCP TCP: Flags=.S..A..., SrcPort=FTP control(21), DstPort=4675, Len=0, Seq=1703559577, Ack=4012585496, Win=16384 (scale factor not found)
5 5.031250 192.168.2.33 200.XXX.YYY.ZZ TCP TCP: Flags=....A..., SrcPort=4675, DstPort=FTP control(21), Len=0, Seq=4012585496, Ack=1703559578, Win=65535 (scale factor not found)
6 5.453125 200.XXX.YYY.ZZ 192.168.2.33 FTP FTP: Response to Port 4675, '220 Microsoft FTP Service'
7 5.453125 192.168.2.33 200.XXX.YYY.ZZ FTP FTP: Request from Port 4675,'USER xxxxxx'
8 5.593750 200.XXX.YYY.ZZ 192.168.2.33 FTP FTP: Response to Port 4675, '331 Password required for xxxxxx.'
9 5.593750 192.168.2.33 200.XXX.YYY.ZZ FTP FTP: Request from Port 4675,'PASS yyyyyyyy'
10 5.687500 200.XXX.YYY.ZZ 192.168.2.33 FTP FTP: Response to Port 4675, '230 User xxxxxx logged in.'
11 5.687500 192.168.2.33 200.XXX.YYY.ZZ FTP FTP: Request from Port 4675, 'SYST'
12 5.765625 200.XXX.YYY.ZZ 192.168.2.33 FTP FTP: Response to Port 4675, '215 Windows_NT'
13 5.765625 192.168.2.33 200.XXX.YYY.ZZ FTP FTP: Request from Port 4675, 'FEAT'
14 5.796875 200.XXX.YYY.ZZ 192.168.2.33 FTP FTP: Response to Port 4675, '211 -FEAT'
15 6.015625 192.168.2.33 200.XXX.YYY.ZZ TCP TCP: Flags=....A..., SrcPort=4675, DstPort=FTP control(21), Len=0, Seq=4012585540, Ack=1703559696, Win=65417 (scale factor not found)
16 6.015625 200.XXX.YYY.ZZ 192.168.2.33 FTP FTP: Response to Port 4675,'211 END'
17 6.015625 192.168.2.33 200.XXX.YYY.ZZ FTP FTP: Request from Port 4675,'CWD /ftpexibidoras'
18 6.062500 200.XXX.YYY.ZZ 192.168.2.33 FTP FTP: Response to Port 4675, '250 CWD command successful.'
19 6.062500 192.168.2.33 200.XXX.YYY.ZZ FTP FTP: Request from Port 4675,'PWD'
20 6.109375 200.XXX.YYY.ZZ 192.168.2.33 FTP FTP: Response to Port 4675, '257 "/ftpexibidoras" is current directory.'
21 6.109375 192.168.2.33 200.XXX.YYY.ZZ FTP FTP: Request from Port 4675,'TYPE I'
22 6.171875 200.XXX.YYY.ZZ 192.168.2.33 FTP FTP: Response to Port 4675, '200 Type set to I.'
23 6.171875 192.168.2.33 200.XXX.YYY.ZZ FTP FTP: Request from Port 4675, 'PASV'
24 6.234375 200.XXX.YYY.ZZ 192.168.2.33 FTP FTP: Response to Port 4675, '227 Entering Passive Mode (200.XXX.YYY.ZZ,6,254).'
25 6.234375 192.168.2.33 200.XXX.YYY.ZZ FTP FTP: Request from Port 4675, 'LIST'
26 6.234375 192.168.2.33 200.XXX.YYY.ZZ TCP TCP: Flags=.S......, SrcPort=4676, DstPort=1790, Len=0, Seq=257555777, Ack=0, Win=65535 (scale factor not found)
27 6.375000 200.XXX.YYY.ZZ 192.168.2.33 TCP TCP: Flags=....A..., SrcPort=FTP control(21), DstPort=4675, Len=0, Seq=1703559868, Ack=4012585585, Win=17431 (scale factor not found)
28 9.296875 192.168.2.33 200.XXX.YYY.ZZ TCP TCP: Flags=.S......, SrcPort=4676, DstPort=1790, Len=0, Seq=257555777, Ack=0, Win=65535 (scale factor not found)
29 15.312500 192.168.2.33 200.XXX.YYY.ZZ TCP TCP: Flags=.S......, SrcPort=4676, DstPort=1790, Len=0, Seq=257555777, Ack=0, Win=65535 (scale factor not found)
30 18.562500 200.XXX.YYY.ZZ 192.168.2.33 FTP FTP: Response to Port 4675, '425 Can't open data connection.'
31 18.703125 192.168.2.33 200.XXX.YYY.ZZ TCP TCP: Flags=....A..., SrcPort=4675, DstPort=FTP control(21), Len=0, Seq=4012585585, Ack=1703559901, Win=65212 (scale factor not found)
Thanks!
Fabio.