Unable to connect to polling engine (APE) on the relevant server. Check logs for details

Dear,

I'm experiencing an error where my APE doesn't want to download configs in NCM.

I also can't manage my nodes anymore that are connected to this polling engine.

What could be the problem here? All necessary ports are open and it still doesn't want to make a connection.

PS: when I look at the config settings I see grey blank fields for APE and can't even enter a path here:

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