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Interactive Broker connection break mid-way, cause data request stuck in a while loop

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terry dylan
terry dylan on 11 Jan 2019
Answered: Annie Leonhart on 1 Mar 2020
I noticed a new problem with IB connection, sometimes when i request data (using either getdata history or timeseries ), the code stuck in the while loop:
while c.DataRequest
i suspect it happend due to using " ib = ibtws('',7496)" , i may have connect + disconnect from TWS too often ?? Or did i request data too often from TWS ? the only solution to make data request work again, is to quit Matlab, and re-launch Matlab, or re-launch TWS
Anybody experienced the same problem before ?
once " ib = ibtws('',7496)" is established, how long does this connection stay?? how to make sure i keep the connection stay there in practice ?
How to reconnect with IB, without stuck in the data request while loop ?? Please help
Best regards


Guillaume on 23 Jan 2020
Peer Boerretzen's non-answer moved here:
Hi I am experiencing exact same problem.
For me it happens when IBTWS automatically restarts every night and matlab get stuck in the while loop you mention when trying to request 'timeseries' data. Have tried with both off-line and on-line version of ibtws and with gateway but same problem.
Would also really apprechiate a solution to this problem
Annie Leonhart
Annie Leonhart on 8 Feb 2020
Download iB Gateway and run it with the log on. Should clearly tell you what’s happening.

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Answers (1)

Annie Leonhart
Annie Leonhart on 1 Mar 2020
At the end of your code close the connection. It only needs to be open when requesting. If you leave it open it'll timeout and you'll try to request more data with the same client ID and it will not run.
simply add to the end of your code and it'll work smoothly every time.


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