In reading through discussions here and elsewhere -- and assuming I correctly understood -- it sounds like the problem with the web-based utility is that it uses SSL 3, which was discontinued by all current browsers due to security concerns (POODLE). It sounds like there was a firmware update for the WAP4410N that addressed this problem, but not for the 4400N.
The solution that worked for me was to put out a call to employees who had unused older smartphones that had been configured some time back for our network's access. Several brought me their dregs, and I was able to use an older Android phone to access the web-based utility to successfully add the newest device to the Wireless Access Control.
This resolved the current issue; and we'll make budget adjustments to purchase a newer WAP to resolve this problem going forward. It's a shame to have to ditch a piece of hardware that's still working flawlessly (our inventory person tells me it was put into service in 10/2006) but for the current inaccessibility of the web-based configuration utility, so if anyone has suggestions for a better workaround I'd appreciate it. But, we can't complain about 9+ years of flawless service from the thing.
