This blog gives you the basic troubleshooting for oracle, Network,Firewall,Wordpress,Linux,cisco router ,Leased line,thin client,server,Windows OS,Open Office ,OpenNMS,squid etc
Open the file $MAVEN_HOME/conf/settings.xml
$MAVEN_HOME/conf/settings.xml
And configure in the <mirrors>...</mirrors> Section
And configure in the
<mirror> <id>central-secure</id> <url>https://repo.maven.apache.org/maven2</url> <mirrorOf>central</mirrorOf> </mirror>