bits.netbeans.org is a virtual host in netbeans-vm.apache.org
bits.netbeans.org/maven2 hosted a Maven Repository with Oracle binaries that cannot be hosted in Apache Infrastructure, for third-party alternatives see https://netbeans.apache.org/about/oracle-transition.html
This virtual host is configured using puppet with this YAML file https://github.com/apache/infrastructure-puppetp6/blob/deploymentproduction/data/nodes/netbeans-vmvm1.apache.org.yaml
Let's Encrypt Certificates
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Certificates will be automatically renewed. The NetBeans VM is one of the first Apache Projects to sport the mod_md module for handling SSL certificates.