Unable to coonect to NinjaTrader

[trader1996]

Hello,

I wrote a java programm that connects to NinjaTrader using the DLL. It works fine on my developing laptop (windows xp). But when I run the programm on my trading computer (windows vista) I got the following error

"Unable to connect to NinjaTrader (localhost/36973). Please make sure NinjaTrader is running"

The "AT Interface" in file menu is on and a connection to "Simulated Data Feed" is established.

Do you have an idea?

Thanks.

Regards,
Markus

[NinjaTrader_Ben]

Hello,

Can you connect via file>connect?
Have you tried turning off your ATI and simulated data feed:
File>disconnect > simulated data feed
File>AT interface

[trader1996]

Hello,

yes, I can connect via file>connect.

I turned on/off data feed and ATI several times. But the connection problem is still there.

Might that be a problem of windows vista or Norton Internet Security 2010?

What else can I do?

Thanks.

Regards,
Markus

[NinjaTrader_JoshP]

Markus,

It could be firewall/antivirus. Can you please try turning those off temporarily?

[trader1996]

Hello,

I solved the problem. I need to use the IP 127.0.0.1 instead of localhost to get a connection to NinjaTrader. Now it works fine.

Regards,
Markus

[sung87wook]

Hello,

I am having the exact same problem. However, I am connecting through the 127.0.0.1 and am still getting the same error message.
Are there any other solutions?
Thanks in advance

[NinjaTrader_JoshP]

sung87wook,

Please check if you have any firewalls or other blocking type of software running. Please try disabling them.

[alexlusher]

Please help me to connect to NtDirect.dll. This is what I have done to establish the connectivity:

• Downgraded NT8 to NT7 since there is note from NT support person that NtDirect.dll does not work properly with NT8
• Installed Python 3.8 32-bit and wrote a script to connect to 32-bit version of NtDirect.dll
• Enabled ATI in the NT7 (32-bit) that is running in the background
• Disabled Firewall in the Windows 10 Settings

The attempt to connect throws a popup with the following error:


"Unable to connect to NinjaTrader (127.0.0.1/36973). Please make sure NinjaTrader is running: No connection could be made because the target machine actively refused it fe80::ff51:40fb:847e:f35b%35:36973"


Here is a Python snippet that is used to connect:

import ctypes
dll_file_path = "C:\\Program Files (x86)\\NinjaTrader7\\bin\\NtDirect.dll"
c_lib = ctypes.WinDLL(dll_file_path)
response_connected = c_lib.Connected(1)
print("Connected :: ", response_connected)​

[NinjaTrader_ChelseaB]

Hello alexlusher,

Welcome to the NinjaTrader forums!

While I cannot assist with an external application written in python, I can provide a link to a sample project that uses the NTDirect.dll.

https://ninjatrader.com/support/forum/forum/ninjatrader-8/strategy-development/100199-orders-are-not-displayed-in-chart?p=793626#post793626