Networking

Check network connections

Netcat

nc -v -z <host> <port>

Tell me if we can open a connection to <host> on <port>. Without -z it works like telnet

nc -v -u -z <host> <port>

Tell me if we can open a connection to <host> on a UDP <port>

Curl

curl -vvv -k --proxy1.0 <proxyIP>:<proxyPort> <Remote URL>

Get the data from <remote URL> -k allows insecure SSL connections

curl -vvv telnet://<IP>:<port>

Just test connectivity to a port

Wget

wget <URL>

Get the data from <URL>

openssl

openssl s_client -showcerts -connect <IP>:443

Test SSL connection