Heartbeat error DEBUG [tcp] tcp/task.go:58 check failed with: EOF

Hi,

You need to post your config for the monitor because we can't see how you configured it.
Also maybe this can help:

A heartbeat monitor which would do the equivalent of this:

# nc -v 10.4.3.5 -port 1525
Ncat: Version 7.50 ( https://nmap.org/ncat )
Ncat: Connected to 10.4.3.5:1525.
^C

would be this:

- type: tcp
  schedule: '@every 5s'
  hosts: ["10.4.3.5"]
  ports: [1525]

But you didn't post your config so it's hard to help.

Martin