I have a C25 Enterasys wireless controller. We have a few Macbook Airs on site. One has Maverick installed and it connects to the internal and guest wireless just fine. One has Yosemite and it can connect to the guest, but not the internal. The network configurations are the same on the laptops. Maverick connects @ 5mhz /n - Yosemite 5mhz/ac. The guest goes straight out to the internet and does not touch the internal network. Both laptops are connected to the domain. Has anyone see this behavior in the past. I tried changing channels on the AP, but no luck. The AP I am closest to is a 3825. I am just not sure why one connects and the other does not. Any help will be appreciated.