Master Source: "There is no source connected to this input."

Hello people,

I'm dealing with a weird problem.
Can't connect to an input-stream.

My situation:
Airtime is on IP-address: 192.168.1.107 (also the primairy IceCast server (port 8000))
Second IceCast server is on IP-address: 192.168.1.106 (port 8002)

When i try to connect to the Master Source, i got the mention:


Also tried the Master Username: source ,but then i got the same error.
Any idea's?