When Android Wi-Fi is off but 3G on, actually you are access FTP server remotely from an external network.
Did you use ftp://WAN IP to access it? WAN IP should be public.

Sorry, but what is ftp:\\WAN IP and how do I open it to public ?


Thanks in advance
Tomer

WAN IP address is assigned by your ISP. If it is private indeed, contact your ISP. By the way, W9980 is working as a modem router or just a router which is working with another modem.
private IP range:10.0.0.0—10.255.255.255； 172.16.0.0—172.31.255.255； 192.168.0.0—192.168.255.255
http://www.tp-link.com/en/faq-638.html

Tomer,

I have the same problem. i tried all configurations, then tried to read the manual step by step with no success.

I must say, that at the very beginning, i disabled the admin user before activating the "internet" (public) option... maybe it is a bug in the firmware? rarely, and i don't think so.


also, i tried to connect trough my neighbor, and she has another ISP, (012Net)

another issue, i enabled ICMP (ping response) and no response from my neighbor.

There is another very important info:

Everything (!) ping, ftp and remote configuration works locally with the public ip address.
but, when i connected from outside, there is no response from any of the above services.

TP-Link released a newer FW version lately, but the release notes are not mentioning this issue.
I prefer not to update this time, because i have a lot of configurations in the router, and they are asking to reset to default when updating the FW version.


My environment details:
Firmware Version:0.6.0 1.10 v0021.0 Build 141215 Rel.41342n
Hardware Version:TD-W9980 v1 00000000
Network Type: PPPoE
ALG Settings: All enabled.
ISP: Xfone
remote ISP: 012Net
Firewall Off.

I hope TP-link will check this issue soon.

@tamts1 You can back up your configuration first. After upgrade and reset your W9980, you can upload the config file.

Everything (!) ping, ftp and remote configuration works locally with the public ip address.
but, when i connected from outside, there is no response from any of the above services.
How did you test remotely?

I tried to use this manual before I posted, it didn't work.

It's an clear to me, why I'm getting two public IP's: - TD W9980: Basic Status >WAN IP 100.b.c.d ("requested" by the manual) - By typing at google.com what is my ip>188.x.y.z

- And of course, my LAN at 192.e.f.g

I tried both of them (Android wifi off) it didn't work
I also installed "PingTools" on my Android, As expected, it ping only the 188.x.y.z port 21 is open
tamts1,
we have the same ISP I updated my firmware just to be sure...



Thanks,

Basic Status---WAN IP address should be the right one.
ftp://100.b.c.d doesn't work?
If there is no problem with your configuration, contact your ISP to discuss on this issue.
http://www.tp-link.com/en/faq-638.html

Your guys can also submit a ticket here if your ISP side is OK.
http://ticket.tp-link.com/index.php?/Tickets/Submit

It's look like the FTP Server is not the issue.

I think if we could ping WAN IP then the problem will be solved.

tamts1,
Please confirm this issue
test1
1. go to Basic Status---WAN and copy the IP on a note 2. Try to ping it form 012net ISP
test2
1. Take the TD W9980 (physically) and connect it to 012net ISP 2. go to Basic Status---WAN and copy the IP on a note 3. ping it from Xfone ISP 4. If it ping create FTP Server on 012net ISP and try to access it from Xfone ISP, if it didn't ping then most likely this issue is on TD W9980

Success!


I contact my SIP and told them that I have WAN block.
She did something in her setting, then I test it again and it worked!



update: It appear that I was right, she created one public IP:
- TD W9980: Basic Status >WAN IP 100.b.c.d ("requested" by the manual)
- By typing at google.com what is my ip>188.x.y.z
are now the same




questions:
1.For SFTP I only need to change port to 22 ?
2. Can Internet Access mode, operate only for a specific MAC address ?



Thanks!

OK Tomer,
I'll do it soon!!!
Thank you very much.

Now i don't need to use my neighbor's extra services.. :-)

BTW, it is a great security idea, i think.