On Windows machines, the freeware open-source software PuTTY is the de-facto standard when it comes to SSH and Telnet. With Windows 10, Microsoft has finally listened to its users after years of them requesting an SSH client and server. By including an OpenSSH implementation, the …

Jun 05, 2014 How to verify that SSL for IMAP/POP3/SMTP works and a May 28, 2020 terminal - How to talk to IMAP server in Shell via OpenSSL

Troubleshooting Outbound Email Using Command Line

A few more options to consider: You may be connecting to a server offering STARTTLS (esp. for IMAP on port 143) in which case you can tell openssl to proceed in negotiating this, you need to specify which protocol you're using (choose from pop3, imap, smtp, ftp); the -crlf option has been mentioned by others, and I also find the -showcerts option useful if I'm debugging an SSL/TLS configuration. Command Line Utilities - OpenSSL The openssl program provides a rich variety of commands, each of which often has a wealth of options and arguments. Many commands use an external configuration file for some or all of their arguments and have a -config option to specify that file. The environment variable OPENSSL_CONF can be used to specify the location of the configuration file. If the environment variable is not specified, a How to make http/https requests yourself with nc/telnet

Basic telnet does not support SSL or TLS, so you have to use openssl or stunnel to make your connection to the smtp server. To connect to a server using TLS/SSL run something like this: openssl s_client -starttls smtp -crlf -connect zcs723.EXAMPLE.com:25 Now you can run one of the above telnet sessions like you had before.

The typical command to initiate a telnet connection to a server is: telnet server port. We (the client) would therefore enter the following at the command prompt: telnet remoteserver.com 25. If you wish to connect to a server using SSL, you can use openssl with the following command (note the default port is … Learn to use the openssl command-line program - TechRepublic Apr 28, 2008 Telnet scenario: Securing Telnet with SSL The Telnet server initializes SSL, and checks the certificate information in the QIBM_QTV_TELNET_SERVER application ID. If the Telnet certificate configuration is correct, the Telnet server begins listening on the SSL port for client connections. A client initiates a request for access to the Telnet …