have just set up a WLC 4402 as a Guest WLan controler on the DMZ of our network.
i have sucsessfully managed to get our internal controllers to connect to it, with the exception of 1. it says the control path is up but the data path is down. the other 14 controllers worked fine, and in testing the last one was ok but it is now not working properly. the 2 controllers can ping each other but just won't create the data tunnel. there is a firewall in the middle but that has been set up to allow traffic between the 2 groups of controllers to be unrestricted.
the internal controllers are 4404's and all controllers are running the same version of code. 18.104.22.168
any ideas would be great.