Our wireless environment consists of IdentiFi wireless version 09.21.08.0013 EWC C5210 and a mix of both 3825i and 3610i AP's. A user with a Microsoft Surface Pro 4 will not connect to an AP that is located directly outside of his office. The AP in question is a 3825i. Despite reboots, disassociating, tweaking tx power, the surface will connect to every other AP in the area except for this one. At one point, the Surface even was connected to another AP despite it being past the threshold set. There are other active clients attached to it but for some reason, no matter what is done to the Surface, it will not connect to this specific 3825.