2016.12.15 11:54:11 ERROR web[][o.s.s.p.UpdateCenterClient] Fail to connect to update center
org.sonar.api.utils.SonarException: Fail to download: https://update.sonarsource.org/update-center.properties (HTTP proxy: MY-PROXY-IP:8080)
(...)
Caused by: java.io.IOException: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 407 authenticationrequired"

#--------------------------------------------------------------------------------------------------
# UPDATE CENTER

# Update Center requires an internet connection to request http://update.sonarsource.org
# It is enabled by default.
#sonar.updatecenter.activate=true

# HTTP proxy (default none)
http.proxyHost=MY-PROXY-IP
http.proxyPort=8080
# HTTPS proxy (defaults are values of http.proxyHost and http.proxyPort)
#https.proxyHost=
#https.proxyPort=

# NT domain name if NTLM proxy is used
#http.auth.ntlm.domain=

# SOCKS proxy (default none)
#socksProxyHost=
#socksProxyPort=

# Proxy authentication (used for HTTP, HTTPS and SOCKS proxies)
http.proxyUser=MY-PROXY-USER
http.proxyPassword=MY-PROXY-PASSWORD