I put on debug and got the following:
time="2020-02-18T15:04:51+01:00" level=info msg="Traefik version 2.1.4 built on 2020-02-06T17:12:23Z"
time="2020-02-18T15:04:51+01:00" level=debug msg="Static configuration loaded {\"global\":{\"checkNewVersion\":true},\"serversTransport\":{\"maxIdleConnsPerHost\":200},\"entryPoints\":{\"hole-1\":{\"address\":\":661\",\"transport\":{\"lifeCycle\":{\"graceTimeOut\":10000000000},\"respondingTimeouts\":{\"idleTimeout\":180000000000}},\"forwardedHeaders\":{}}},\"providers\":{\"providersThrottleDuration\":2000000000},\"log\":{\"level\":\"DEBUG\",\"format\":\"common\"}}"
time="2020-02-18T15:04:51+01:00" level=info msg="\nStats collection is disabled.\nHelp us improve Traefik by turning this feature on :)\nMore details on: https://docs.traefik.io/v2.0/contributing/data-collection/\n"
time="2020-02-18T15:04:51+01:00" level=debug msg="Start TCP Server" entryPointName=hole-1
time="2020-02-18T15:04:51+01:00" level=info msg="Starting provider aggregator.ProviderAggregator {}"
time="2020-02-18T15:04:51+01:00" level=info msg="Starting provider *traefik.Provider {}"
time="2020-02-18T15:04:51+01:00" level=debug msg="Configuration received from provider internal: {\"http\":{},\"tcp\":{},\"tls\":{}}" providerName=internal
time="2020-02-18T15:04:51+01:00" level=debug msg="No default certificate, generating one"
Don't if that says anything useful.