Which error do you get when it fails? The servers are online.
The status dialog shows:
B4i version: 2.30
Parsing code. (0.04s)
Compiling code. (0.08s)
Compiling layouts code. (0.02s)
Building Xcode project (0.21s)
Sending data to remote compiler. Error
Communication error: RequestCanceled
Now the host builder has been working for me ever since I started using it 7days now. But has started timing out to which at this point has failed to compile or build.
I tried it on different ISP as well just in case some ports or IP's were mow being blocked but same failuer.