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Old 04-14-2005, 03:19 PM   #1
knocx
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Exclamation Weird Problem, occured new...

We are an ISP suggesting using FlashFxp to our clients for years...

But since 2-3 days our clients using Windows XP started to have problems connecting to ftp .

however this seem not only a FlashFxp problem but directly related with windows XP.

FTP Server :Serv-U 6.x

Some Symptom logs

Response: 220 Serv-U FTP Server v6.0 for WinSock ready...
Command: USER nordsis
Response: 331 User name okay, need password.
Command: PASS *************
Response: 230 User logged in, proceed.
Command: FEAT
Response: 211-Extension supported
Response: CLNT

-----hangs here

FlashFXP v3.1.12 build 1075 [BETA RELEASE]
Support Forums at http://forum.flashfxp.com

[R] Connecting to yildizcelik -> DNS=ftp.yildizcelik.com IP=69.0.231.116 PORT=21
[R] Connection failed (Connection timed out)
[R] Delaying for 120 seconds before reconnect attempt #1
[R] Connecting to yildizcelik -> DNS=ftp.yildizcelik.com IP=69.0.231.116 PORT=21 (attempt # 1)
[R] Connection failed (Connection timed out)

-----can not connect

[R] Delaying for 45 seconds before reconnect attempt #3
[R] Connecting to Ayaz Otel -> DNS=ftp.ayazhotels.com IP=67.15.120.33 PORT=21 (attempt # 3)
[R] Connected to Ayaz Otel
[R] 220 Serv-U FTP Server v6.0 for WinSock ready...
[R] USER ayaz
[R] 331 User name okay, need password.
[R] PASS (hidden)
[R] 230 User logged in, proceed.
[R] SYST
[R] 215 UNIX Type: L8
[R] FEAT
[R] 211-Extension supported
[R] CLNT

-----hangs here

- i can not provide exact versions but we have at least 50-60 clients today having the same issue mostly using
flashfxp .

- Clients can connect to FTP via commandline ftp utility (ftp.exe) or I.E but can not with their ftp clients.


Any suggestions will be appreciated

Regards
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Old 04-14-2005, 03:31 PM   #2
bigstar
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Are you using the latest version of Serv-U? v6.0.0.2

I have Serv-U v6.0.0.2 installed for testing and I'm not seeing any problems with connecting with FlashFXP on Windows XP.

The command line ftp client doesn't send the FEAT command, perhaps serv-u is trying to read a corrupted value or something for this command, you could try turning off FEAT as a test.

Site Manager > Options Tab > Uncheck "Site does not support FEAT command"

As a test I believe you can also manually send FEAT using ftp.exe, this might help you narrow down the problem.
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Old 04-14-2005, 03:32 PM   #3
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can you provide logs from working session?
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Old 04-14-2005, 03:55 PM   #4
knocx
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Ok;

Its also strange that we dont have these issues in our Linux Servers ProFTPD , but only Serv-u; with Ipswitch WS_FTP, CuteFTP and Flash FXP 3.1.12 (build 1075) BETA ...

Hmm.. Strangely when we issue FEAT Command

FEAT
211-Extension supported
CLNT
--- Hangs

seems Serv-u does not support FEAT...

does Servu 6.0.0.2 implements FEAT? do you know that

thank you
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Old 04-14-2005, 04:00 PM   #5
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btw : our serv-u versions are 6.0.0.0
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Old 04-14-2005, 05:44 PM   #6
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serv-u does support FEAT since it's replying with a list of extensions
otherwise it would reply with 'command not understood'

you say no problem with proftpd, it support FEAT?
have you tried disabling FEAT on serv-u? also considered updating your server to the latest version?

maybe some firewall on your network is somehow conflicting with ftp sessions?
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Old 04-14-2005, 05:56 PM   #7
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It seems like Serv-U is corrupted or something, Also you might considering upgrading it may resolve your problem.
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Old 04-14-2005, 06:28 PM   #8
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This happens in all serv-u servers (actually 5) its very low probability that 5 of them corrupted at the same day...h there must be something else... but what can it be anyway i will try to upgrade to 6.0.0.2 and report it.

thanks
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Old 04-15-2005, 03:30 AM   #9
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Upgraded to Servu 6.0.0.2 and I did several test ,

When FlashFXP issues FEAT Servu hangs...

Tested on W2k W2003, XP as the client using FlashFXP

I have reported this issue to Servu, as it seems they have a problem.

thanks
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Old 04-15-2005, 04:48 AM   #10
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if it problem with servu and FEAT command, you can temporary disable it in site manager
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Old 04-15-2005, 04:50 AM   #11
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yes this is what we offer to our clients right now
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