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your haproxy config is incorrectly assuming TURN/TLS is http:

mode http
server app-01 10.0.0.20:5349

I'm not familiar with haproxy setup, but I think you'll need to use sni (level 4 TLS termination) instead.

@dry-elephant-14928 Thanks for a quick reply! We’ve changed haproxy mode to tcp:

frontend turn_livekit
bind 0.0.0.0:5349
mode tcp
default_backend turn_livekit_backend
maxconn 65000

backend turn_livekit_backend
#mode http
mode tcp
#server app-01 10.0.0.20:5349
server app-01 10.0.0.20

Our current TURN config:

turn:
  enabled: true
  domain: <http://turn.xyz.com|turn.xyz.com>
  tls_port: 3478
  cert_file: /working/path/to/cert
  key_file: /working/path/to/key
  external_tls: false

Unfortunately with no effect 😕