Thanks for your post.
The 917.8 build is the correct build to use with NinjaTrader for the time being. I understand that IB will be dropping support for this version, but this does not happen until later in the month. We will have another build available by that time, but currently you should be using that 917.8 build.
When attempting to connect, does an error of some kind occur? What does the error report?
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