buddy

?

While you are absolutely correct that there is a bug here, there is also a very simple workaround.

?

I described this in some detail in the thread where we discussed it back in September 2022: /g/twsapi/topic/93660462

?

In particular see my two posts on 16 September.

?

The bottom line is that what causes the problem is requesting market data for a particular contract, then disconnecting the API (without cancelling the data) before any other client requests the same market data.

?

And the simple workaround is: always cancel market data before disconnecting from the API.

?

In fact this is actually overkill: it’s only strictly necessary to cancel the data before disconnecting when this is the first request for that contract and no other client has yet made the same request; but always cancelling before disconnecting is simple to implement, and of course in general there’s no way your client program can know whether any other client has made the same request.

?

Richard

?

?

?