Allmon3 does not connect to private node 1999
It tells asterisk to do it. One node connect to some other node.
It does not preform the connection. Just an instruction.
ASL is getting the instruction. Not responding as desired because of the lack of proper config.
Your issue is in your asl3 files.
The 5 most popular reasons for connection failure
https://wiki.allstarlink.org/wiki/Private_nodes
Because I am not going to repeat myself, you will just need to do some reading.
If there is something you don’t understand, ASK.