Put one 411 at the new building, point it at the 411 that is set as the Access Point. Set up the new 411 just like the 411 that is already setup as the wireless client.
Three 411’s total: 1 Access Point, 1 Client, 1 Client.
Make sure that the 411 at building 1 is set as the access point, then at both building 2 & 3 use the same settings but with differant IP address.
ex: building 1–ip 17.1.3.2 name control channel 45 mode access
building 2–ip 17.1.3.3 name building 2 channel 45 mode bridge
building 3–ip 17.1.3.4 name building 3 channel 45 mode bridge
Now you have a back bone that will not be seen on the network but will tie all three buildings together.
I finally got back to this. It turns out that I had the bridge 411AR set in bridge mode. Once I switched it to AP Bridge, I was able to properly connect. Luckily, we had bought a level 4 license so I was able to properly connect.
The trick for me was realizing that I had not enable the wireless log messages. Once I turned them on, the “too many stations” message popped up and I was able to realize (thanks to the replies above) that I had to change the mode.
Now I need to turn on the 2nd antenna to provide a WAP for the local systems.