5.1 (LMY47M) has re-broken Cisco wifi problem that was fixed with 5.0.1

Make sure that your network is using AES encryption. TKIP isn't secure and different manufacturers have taken different steps to make it more (very little more) and they're not all compatible. (TKIP is basically WEP with a patch that's doesn't do much.)

If the router uses TKIP, or TKIP+AES, blame the fact that Cisco is still about 7 years behind the times (Beck-Tews was released in 2008), and TKIP of any sort should have gone the way or WEP - an interesting historical fact, not a current "standard".
 
We have 5 Cisco wireless AP's in my office, all using AES. I've had no issues connecting to them with 5.1M with N5, N6 and N7.
 

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