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[ofaheem1974]

Hi, I have to submit an assignment for my university in which I have to make a FTP server and allow my professor to access through Internet I am using Dlink DSL-2750B and tries to open FTP port 21 through port forwarding in Dlink router but received an error ""Since port 21 is used as FTP remote access port, external port range [21-21] is invalid"  and does not add the FTP port so please help me in this regard

Thanks & regard,
Osama Faheem

[FurryNutz]

Link>Welcome!

• What Hardware version is your modem? Look at the sticker under modem.
• Link>What Firmware version is currently loaded? Found on the modems web page under status.
• What region are you located?

How do you have FTP configured on the modem?
Please post a picture of the configuration: Adding Screenshots In A Post


Also, you may need to disable uPnP if you use and Port Forwarding configurations.
Port configurations for external may need to use port 21 then assign a different port to the internal port side of the modem, say 50117 for example. I don't think you can use port 21 for both internal and external ports.

[ofaheem1974]

Hi,

Thanks for your reply Here are all the details below:
Product Code: DSL-2750B
First Name: Osama
Last Name: Faheem
Email: osamafaheem1974@hotmail.com
Operating System: Windows Sever 2012
Hardware Version: T1
Firmware Version: AU_3.01
Serial Number: PX2A1DA004304
Phone: +61474117093
Service Pack: -
Purchased From: Australia

I have configured nothing on the modem except port forwarding for FTP on modem
also how to disable uPnP on the modem

[ofaheem1974]

Hi

What I did in port forwarding right now is that I put External port start 21 External port end 21 protocol TCP and internal port 50117 but the same error came
"Since port 21 is used as FTP remote access port, external port range [21-21] is invalid" 

Please advice what to do

[FurryNutz]

I recommend that you phone contact your regional D-Link support office and ask for help and information regarding this. We find that phone contact has better immediate results over using email.
Let us know how it goes please.

[RYAT3]

Hi

What I did in port forwarding right now is that I put External port start 21 External port end 21 protocol TCP and internal port 50117 but the same error came
"Since port 21 is used as FTP remote access port, external port range [21-21] is invalid" 

Please advice what to do

Are you using port forwarding (single port) or port triggering(multiple)?

Try assigning in port forward an unused port number that's valid (50117 might work?) And forward that to your internal machine on port 21.

Then just ftp your external ip address with the external pretty 50117 in this example.

[FurryNutz]

Any status on this? 

[ofaheem1974]

Hello Everybody,

Well the status is this I posted a call at Dlink site and they yesterday called me. They were saying to upgrade the firmware to AU_3.06 I was using AU_3.01 and then after that restore the router to default settings which I did but dear all no use the problem remain the same now the interesting scenario is this that when I open port of RDP 3389 and check it at http://www.yougetsignal.com/tools/open-ports/ it showed port is open but when I open the port at port forwarding section in Dlink DSL-2750B for PPTP 1723 the same site port is closed although port forwarding is configured at router. Any ideas why this is happening

Dlink guys failed to resolve this issue

So please guide me. Kindly note I am not using port triggering I am using port forwarding

Thanks & regard,
Osama Faheem

[FurryNutz]

See if the configuration helps:
http://forums.dlink.com/index.php?topic=14755.0

Not sure of PPTP will be an issue here or not...