traefik: Random 500 Error returned by Traefik

################################################################
# Global configuration
################################################################

# Timeout in seconds.
# Duration to give active requests a chance to finish during hot-reloads
#
# Optional
# Default: 10
#
graceTimeOut = 10

# Traefik logs file
# If not defined, logs to stdout
#
# Optional
#
traefikLogsFile = "/var/log/traefik/traefik.log"


# Access logs file
#
# Optional
#
accessLogsFile = "/var/log/traefik/traefik-access.log"

# Log level
#
# Optional
# Default: "ERROR"
#
logLevel = "DEBUG"

# Backends throttle duration: minimum duration between 2 events from providers
# before applying a new configuration. It avoids unnecessary reloads if multiples events
# are sent in a short amount of time.
#
# Optional
# Default: "2s"
#
ProvidersThrottleDuration = 1


# If non-zero, controls the maximum idle (keep-alive) to keep per-host.  If zero, DefaultMaxIdleConnsPerHost is used.
# If you encounter 'too many open files' errors, you can either change this value, or change `ulimit` value.
#
# Optional
# Default: http.DefaultMaxIdleConnsPerHost
#
MaxIdleConnsPerHost = 200

# If set to true invalid SSL certificates are accepted for backends.
# Note: This disables detection of man-in-the-middle attacks so should only be used on secure backend networks.
# Optional
# Default: false
#
InsecureSkipVerify = false

# Entrypoints to be used by frontends that do not specify any entrypoint.
# Each frontend can specify its own entrypoints.
#
# Optional
# Default: ["http"]
#
defaultEntryPoints = ["http"]

################################################################
# Web configuration backend
################################################################

[web]
address = ":8080"

################################################################
# Mesos/Marathon configuration backend
################################################################

# Enable Marathon configuration backend
#
# Optional
#
#[marathon]
[marathon]


# Marathon server endpoint.
# You can also specify multiple endpoint for Marathon:
# endpoint := "http://10.241.1.71:8080,10.241.1.72:8080,10.241.1.73:8080"
#
# Required
#
endpoint = "http://101.211.1.11:8080,101.211.1.13:8080,101.211.1.13:8080"

# Enable watch Marathon changes
#
# Optional
#
watch = true

# Default domain used.
#
# Required
#
domain = "traefik.service.consul"

# Override default configuration template. For advanced users :)
#
# Optional
#
# filename = "marathon.tmpl"
filename = "/opt/traefik/conf/marathon.tmpl"

# Expose Marathon apps by default in traefik
#
# Optional
# Default: false
#
exposedByDefault = false


# Convert Marathon groups to subdomains
# Default behavior: /foo/bar/myapp => foo-bar-myapp.{defaultDomain}
# with groupsAsSubDomains enabled: /foo/bar/myapp => myapp.bar.foo.{defaultDomain}
#
# Optional
# Default: false
#
groupsAsSubDomains = false

# Enable Marathon basic authentication
#
# Optional
#
[marathon.basic]
httpBasicAuthUser = "xxx"
httpBasicPassword = "xxxxxxx"

# To enable more detailed statistics
[web.statistics]
   RecentErrors = 10
# To enable Traefik to export internal metrics to Prometheus
[web.metrics.prometheus]
   Buckets=[0.1,0.3,1.2,5.0]

# TLS client configuration. https://golang.org/pkg/crypto/tls/#Config
#
# Optional
#
# [marathon.TLS]
# InsecureSkipVerify = true


[retry]