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The actual public server certificate is next: Server certificate I:/C=US/O=DigiCert Inc/CN=DigiCert Cloud Services CA-1ġ s:/C=US/O=DigiCert Inc/CN=DigiCert Cloud Services CA-1 The next section contains details about the certificate chain: Certificate chainĠ s:/C=US/ST=Washington/L=Redmond/O=Microsoft Corporation/CN= Verify error:num=20:unable to get local issuer certificate Loading 'screen' into random state - doneĭepth=1 /C=US/O=DigiCert Inc/CN=DigiCert Cloud Services CA-1 The first section presented is around the connection information: openssl s_client -connect :443 The following example is showing a connection on port 443 against.
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The output generated contains multiple sections with - spearators between them. Where is replaced with the fully qualified domain name (FQDN) of the server we want to check. To query a smtp server you would do the following: openssl s_client -connect :25 -starttls smtp To query a web server you would do the following: openssl s_client -connect :443 The syntax that we use depends on what type of server we are querying.
Kindred spirits meaning windows#
For this article I will be using the Windows version of OpenSSL which can be downloaded from. OpenSSL is available for multiple platforms including Linux, MacOS & Windows (via gnuwin32). OpenSSL is a robust, commercial-grade, and full-featured toolkit for the Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols. While there are multiple methods that can be used to validate a certificate presented from a server I am going to be focusing on openssl here. Sometimes this is a SMTP server or it could be a web server. From time to time it may be necessary to verify what certificate is being presented by the server that you are connecting to.