Tvheadend

Interesting app even can monitor multi instances.
Will test it.
What not working in your case?

[2019-05-07 19:19:14] ERROR: Authentication/authorization failed when connecting to 1 (HTTP 401)
[2019-05-07 19:19:14] WARNING: Instance 1 not reachable, will wait for 10 cycles before retrying
[2019-05-07 19:19:14] ERROR: Authentication/authorization failed when connecting to 2 (HTTP 401)
[2019-05-07 19:19:14] WARNING: Instance 2 not reachable, will wait for 10 cycles before retrying
[2019-05-07 19:19:14] ERROR: Authentication/authorization failed when connecting to 3 (HTTP 401)
[2019-05-07 19:19:14] WARNING: Instance 3 not reachable, will wait for 10 cycles before retrying
i get error from 3 tvh

Beginners error, turn off digest authentication.

in my case there is a error with database or something similar

PHP Notice:  Undefined offset: 1 in /opt/tvheadend-status-manager/src/cli/Database/Input.php on line 63

  [Propel\Runtime\Exception\PropelException]
  Unable to execute INSERT statement [INSERT INTO input (uuid, instance_name, started, input, mux, weight) VALUES (:p0, :p1, :p2, :p3, :p4, :p5)]

  [PDOException]
  SQLSTATE[23000]: Integrity constraint violation: 19 NOT NULL constraint failed: input.network

i did turn off digest authentication before but still not working
i try both plain and digest & only plain same error to me