MATLAB Answers

Error Msg ' Not Connected' in IB Trading Toolbox with Interactive Brokers TWS

17 views (last 30 days)
AlgoTrader
AlgoTrader on 20 Jan 2015
Commented: Annie Leonhart on 8 Feb 2020
I am having issues using the Trading Toolbox with Interactive brokers. I have tried this on two separate TWS/Matlab installations on two different machines, connected to two different IB accounts. Both connect to Excel via the TWS api/DDE without difficulty.
I have the latest TWS and api software installed. ActiveX socket clients and DDE are enabled in the TWS api settings. Trusted ip is set to 127.0.0.1. ibtws object seems to be created fine:
ib =
ibtws with properties:
ClientId: 0
Handle: [1x1 COM.TWS_TwsCtrl_1]
Host: ''
Port: 7599
However, any attempt to retried data produces a 'not connected' error message in Matlab. For example: ib.Handle.createContract; ibContract.symbol = 'GS'; ibContract.secType = 'STK'; ibContract.exchange = 'NYSE'; ibContract.currency = 'USD'
ibContract =
Interface.AE6A66F3_8FA9_4076_9C1F_3728B10A4CC7
>> getdata(ib, ibContract)
ans =
Not connected

Answers (5)

Ray Ducharme
Ray Ducharme on 4 May 2016
For me, it turned out I was using the wrong port. By going into...
TWS -> File -> Global Configuration -> API -> Settings -> Socket port...
I noticed the port number was not '7496' as seen in most Matlab examples (very close but not the same!). Making the switch fixed the "Not connected" error I was getting.
ib = ibtws('',7496) # <-- Switch the 7496 to your configuration port.
Good luck!

Alexey Yeremenko
Alexey Yeremenko on 28 Oct 2015
Hello
Have you been able to connect? I got the same problem. No idea how to fix it.

  0 Comments

Sign in to comment.


Yair Altman
Yair Altman on 7 Nov 2015
This problem is due to using the ActiveX connector to IB.
You might wish to try the cross-platform Java-based approach (not ActiveX) of the IB-Matlab product: http://undocumentedmatlab.com/ib-matlab

  0 Comments

Sign in to comment.


Lars Helfenstein
Lars Helfenstein on 29 Apr 2016
Hi, did one of you ever find a solution? I got the same and checked and installed everything several times.

  0 Comments

Sign in to comment.


Jack Kenney
Jack Kenney on 22 Jan 2020
Some customers have reported that it helps to specify the client id requirement during connection like this:
ib = ibtws('127.0.0.1', 7496, 0);
(Replacing 7496 with your configuration port)
Documentation for the Client ID argument in the "ibtws" function is available here:

  3 Comments

Annie Leonhart
Annie Leonhart on 23 Jan 2020
You answer a question from 5 years ago. I'm sure they've figured it out by now.
Guillaume
Guillaume on 23 Jan 2020
Answers are not just for the benefit of the original poster. Others are encouraged to search answer and see if their question has already been answered.
Annie Leonhart
Annie Leonhart on 8 Feb 2020
It’s already in the toolbox instructions. It clearly states how to set up the api.

Sign in to comment.