People Picker issues
There are quite many posts on debugging people picker issues and hence this post is primarily to highlight recent increase in people picker issues because of network appliances.
It is best to take a two way network capture(between WFE and desktop) and analyze the same. make sure you do a ipconfig /flushdns before start of capture.
We observed that some third party network appliances are blocking people picker requests as SQL injections and causing People Picker to fail.
Will add more details later.
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