The default is 100 concurrent reqMktData streams but only 3
reqTickByTick streams. Also, market depth is limited to 3
concurrent.
If you are getting the error for more than one request per 15
seconds that's probably what is happening. IB does screw up
sometimes but usually it's a problem on the client side.
It would be useful to log all your activity or enable API logging
so you can see what is actually being received by TWS.
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I also read
"[b]y default, every user has a maxTicker Limit of 100 market data
lines and as such can obtain the real time market data of up to
100 instruments simultaneously." 3 instruments
is less than 100, and 6 (=3x2) requests is less than 100, so I
think I'm good there.
