I have the same problem: I have a Lenovo Thinkpad X230 with Windows 8.1 and I tried the drivers delivered with Windows 8.1 as well as the latest Intel drivers from December. I still get the limited connection error even though the routers I tested don't show any error and other connected devices work properly. I used the Netgear WNDR4300 router and the Netgrear R7000 and they work without a problem with other devices. Only my laptop with Intel Centrino Ulimate N6300 AGN has constantly issues. Looks like the problem is not fixed even after 1 year. bad job Intel.
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