Command Line Utilities - OpenSSL

If you have only imaps enabled, see "remote login" section below for how to test using openssl s_client. Check that it's allowing logins # telnet localhost 143 a login "username" "password" Replace the username and password with the ones you added to passwd.dovecot in BasicConfiguration. Note that all IMAP commands begin with a tag, which is Email Troubleshooting, Including IMAP, Dovecot, and Linux openssl; telnet; Be sure to internalize this hierarchy for maximum troubleshooting productivity. Using the hierarchy and tools, you should be able to solve email client connection problems with a known good IMAP or POP server within minutes, not hours. ssl - OpenSSL s_client not detecting STARTTLS - Unix From this you can see that openssl is connecting with IPv4, whereas $ telnet 25 Trying 2a01:4f8:c17:3bac::2 with telnet you are obviously using IPv6. Thus my guess is that the ISP is intercepting IPv4 connections but not IPv6 connections. You can check this out by enforcing IPv4 with telnet, i.e. telnet -4

telnet - Openssl command s_client always says 400 Bad

tls - How do I use "openssl s_client" to test for (absence How can I use openssl s_client to verify that I've done this? Stack Exchange Network Stack Exchange network consists of 177 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Mail: Connect TLS encrypted to a smtp server by telnet Hi, the SMTP protocol is ASCII based. In the past, the SMTP protocol goes unencrypted over the wire means you can simply send emails by connecting to the SMTP port 25 and enter some SMTP commands via telnet: Many provider does no longer accept such plain text connections. You can use openssl instead. Connect to Port 25 to your SMTP server and said Hello (EHLO). If connected the S

terminal - How to talk to IMAP server in Shell via OpenSSL

How To Use OpenSSL s_client To Check and Verify SSL/TLS Of OpenSSL provides different features and tools for SSL/TLS related operations. s_lient is a tool used to connect, check, list HTTPS, TLS/SSL related information.Simply we can check remote TLS/SSL connection with s_client .In this tutorials we will look different use cases of s_client .. … OpenSSL OpenSSL is a robust, commercial-grade, and full-featured toolkit for the Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols. It is also a general-purpose cryptography library. For more information about the team and community around the project, or to start making your own contributions, start with the community page. telnet - Openssl command s_client always says 400 Bad I am trying to test a server that is working normal in web browser, with openssl s_client option, connecting it directly using openssl returns the 400 Bad Request: openssl s_client -servername exa SMTP STARTTLS certificate negotitiation via telnet - Stack