Is the IB backfill working?

If you are writing your own code, chances are you are not filling in all the required parameters correctly.

Try the sample app comes with IB API. It does a decent job getting historical data. You can look at the parameters there.
 
i had problems with EUREX backfill this morning European time, until about noon - similar thing happened yesterday, i.e. no backfill for EUREX for a few hours.
 
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