Categories
SysOps

How to display TLS server extensions

Use openssl command-line utility to display TLS server extensions.

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Uncategorized

How to determine if web-server still supports deprecated TLS 1.0 protocol

Use essential openssl utility to quickly determine if your web-server still supports deprecated TLS 1.0 protocol.

Categories
SysOps

How to locally check SSL certificate

Check locally stored SSL certificate using essential utilities like openssl and curl. This knowledge is especially useful when you want to prepare an SSL certificate for a load balancer.

Categories
SysOps

How to generate and decode CSR

Create a certificate signing request and use it to generate an SSL certificate. I strongly suggest reading my two earlier blog posts about self-signed SSL certificates and private keys as these contain useful information. I will describe three different ways to generate a certificate signing request.

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Uncategorized

How to generate private key

Generate private key for an SSL certificate and verify its consistency.

Categories
SysOps

How to display days till certificate expiration

Use openssl command-line utility to calculate and display days till the certificate expiration.

Categories
SysOps

How to display certificate issuer and dates

Use openssl command-line utility to display common name, certificate issuer, alternative names, start/end dates.