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This post describes how to see TCP connection establishment and termination as packets using tcpdump on linux. Preparing Install the following commands on our linux. tcpdump nc telnet netstat Start a TCP connection establishment Start TCP connection using nc command with l,k option. Open another terminal and verify 12345 port is listening using netstat command. …

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The OpenSSL s_client command is a helpful test client for troubleshooting remote SSL or TLS connections. This post covers various examples of testing SSL connections with different ciphers, TLS versions, and SSL server certificate analysis. OpenSSL s_client connect openssl s_client -connect example.com:443 Use the openssl s_client -connect flag to display diagnostic information about the SSL …

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