Wireless Networking D-Link DI-524 blocks FTP xfer

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Subject Author Date
D-Link DI-524 blocks FTP xfer windsurferLA 05-30-08
Posted by windsurferLA on May 30, 2008, 4:53 am
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Hardware ... DELL E510, 3GHz w/ 1 GB RAM
D-Link DI-524 router, Motorola SURFboard cable modem.
Software .. WinXP SR-3, "FTP Commander" and/or WS_FTP95

Somehow, I must have inadvertently changed the firewall settings on my
router as I cannot do FTP transfers when connected to the SURFboard
modem via the D-Link DI-524 router. I could swear that it used to work.
I have no problem with general web surfing.
However, if I bypass the router, I can see the files on the server and
upload files. If the router is in the path, in cannot see the contents
of the directories or upload files.

Any suggestions? WindsurferLA



Posted by LR on May 30, 2008, 5:25 am
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windsurferLA wrote:
> Hardware ... DELL E510, 3GHz w/ 1 GB RAM
> D-Link DI-524 router, Motorola SURFboard cable modem.
> Software .. WinXP SR-3, "FTP Commander" and/or WS_FTP95
>
> Somehow, I must have inadvertently changed the firewall settings on my
> router as I cannot do FTP transfers when connected to the SURFboard
> modem via the D-Link DI-524 router. I could swear that it used to work.
> I have no problem with general web surfing.
> However, if I bypass the router, I can see the files on the server and
> upload files. If the router is in the path, in cannot see the contents
> of the directories or upload files.
>
> Any suggestions? WindsurferLA
>
>
Port forwarding?
<http://portforward.com/english/routers/port_forwarding/Dlink/DI-524/FTP.htm>


Posted by DanS on May 30, 2008, 12:37 pm
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$4c368faf@roadrunner.com:

> Hardware ... DELL E510, 3GHz w/ 1 GB RAM
> D-Link DI-524 router, Motorola SURFboard cable modem.
> Software .. WinXP SR-3, "FTP Commander" and/or WS_FTP95
>
> Somehow, I must have inadvertently changed the firewall settings on my
> router as I cannot do FTP transfers when connected to the SURFboard
> modem via the D-Link DI-524 router. I could swear that it used to work.
> I have no problem with general web surfing.
> However, if I bypass the router, I can see the files on the server and
> upload files. If the router is in the path, in cannot see the contents
> of the directories or upload files.
>
> Any suggestions? WindsurferLA

You are talking about an FTP client behind your router connecting to an FTP
server somewhere on the Internet right ?

In whatever FTP client you are using, check the Passive Mode (PASV) setting
for the connection. Tunr it off/or on and try it that way.


Posted by windsurferLA on May 30, 2008, 2:33 pm
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DanS wrote:
> $4c368faf@roadrunner.com:
>
>> Hardware ... DELL E510, 3GHz w/ 1 GB RAM
>> D-Link DI-524 router, Motorola SURFboard cable modem.
>> Software .. WinXP SR-3, "FTP Commander" and/or WS_FTP95
>>
>> Somehow, I must have inadvertently changed the firewall settings on my
>> router as I cannot do FTP transfers when connected to the SURFboard
>> modem via the D-Link DI-524 router. I could swear that it used to work.
>> I have no problem with general web surfing.
>> However, if I bypass the router, I can see the files on the server and
>> upload files. If the router is in the path, in cannot see the contents
>> of the directories or upload files.
>>
>> Any suggestions? WindsurferLA
>
> You are talking about an FTP client behind your router connecting to an FTP
> server somewhere on the Internet right ?
>
> In whatever FTP client you are using, check the Passive Mode (PASV) setting
> for the connection. Tunr it off/or on and try it that way.
>
Checking Passive Mode did the trick.. Turning it on makes it work. Thanks

Posted by DanS on May 30, 2008, 5:31 pm
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> DanS wrote:
>> $4c368faf@roadrunner.com:
>>
>>> Hardware ... DELL E510, 3GHz w/ 1 GB RAM
>>> D-Link DI-524 router, Motorola SURFboard cable modem.
>>> Software .. WinXP SR-3, "FTP Commander" and/or WS_FTP95
>>>
>>> Somehow, I must have inadvertently changed the firewall settings on
>>> my router as I cannot do FTP transfers when connected to the
>>> SURFboard modem via the D-Link DI-524 router. I could swear that it
>>> used to work.
>>> I have no problem with general web surfing.
>>> However, if I bypass the router, I can see the files on the server
>>> and upload files. If the router is in the path, in cannot see the
>>> contents of the directories or upload files.
>>>
>>> Any suggestions? WindsurferLA
>>
>> You are talking about an FTP client behind your router connecting to
>> an FTP server somewhere on the Internet right ?
>>
>> In whatever FTP client you are using, check the Passive Mode (PASV)
>> setting for the connection. Tunr it off/or on and try it that way.
>>
> Checking Passive Mode did the trick.. Turning it on makes it work.
> Thanks

Glad it worked out...I don't know why it would have changed. Most FTP
clients have a global setting, under the main options, which is applied
to all new connections. And then each individual connection detail has a
PASV mode override on a per-connection basis.

I never really did understand passive mode. My FTP site, inside my
network, requires that passive mode be turned off or it never gets a data
channel. The initial connection works OK, as you can see in the log, but
then it would say 'can't open data channel'. Everything I've seen says
PASV mode is for connecting to an FTP behind a NAT rtr...but not mine.

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