Securing Open DNS Resolvers (Preventing Abuse)

An Open DNS Resolver is a server that accepts recursive DNS queries from anyone on the internet. While this sounds he......

Securing Memcached (Preventing UDP Amplification)

Memcached is a high-performance caching system. However, by default, it listens on all interfaces and has UDP enabled......

Securing an Open SNMP Server (Port 161)

The Simple Network Management Protocol (SNMP) is used to monitor network devices and servers. However, incorrect conf......

Securing Portmapper / RPCbind (Port 111)

The Portmapper service (also known as rpcbind) is used to map Remote Procedure Call (RPC) services to network ports. ......

Securing your VPS: Blocking SSDP (Port 1900)

Simple Service Discovery Protocol (SSDP) is a network protocol meant for residential networks (e.g., to find printers......

Securing an Open Elasticsearch Server

Elasticsearch is a powerful search engine, but it lacks built-in security features in its default open-source configu......