Text in red represents commands typed by the user: $ openssl s_client -connect :443Ġ s:/OU=Domain Control Validated/CN=*. For example, the following text shows an exchange between an openssl client and a remote web server. With openssl, you can open a secure connection to a remote server on port 443, and then send raw HTTP commands. Web server testing is a very common troubleshooting scenario. If this were a self-signed certificate, openssl would display the following lines: verify error:num=18:self signed certificate Additionally, the certificate expires on June 11, 2016. In this output, you can see that the certificate is issued by a Certificate Authority (CA) and uses a SHA-256 fingerprint. Subject: OU=Domain Control Validated, CN=*. Signature Algorithm: sha256WithRSAEncryption Issuer: C=BE, O=GlobalSign nv-sa, CN=AlphaSSL CA - SHA256 - G2 Validity Not Before: Jun 11 19:26:24 2015 GMT The following sample output shows some important lines marked in bold: $ openssl s_client -connect :443 -servername -showcerts | openssl x509 -text -nooutĭepth=1 C = BE, O = GlobalSign nv-sa, CN = AlphaSSL CA - SHA256 - G2ģ1:11:4a:f7:c9:0e:fa:ff:9c:de:ad:be:ef:8a:84:1d:66:53 If so, use the port number for that protocol instead. However, if you have an unmanaged server, you may be using an SSL certificate to secure other services (for example, IMAP or Asterisk) instead of HTTP. SSL certificates are most commonly used to secure web sites, so the command above uses port 443 (HTTPS). Replace with your own domain name: openssl s_client -connect :443 -servername -showcerts | openssl x509 -text -noout You can also examine the certificate's validity, expiration date, and much more. For example, you can check whether a certificate is signed by a valid Certificate Authority (CA) or is self-signed. You can use the openssl program to test and verify SSL certificates. The following sections demonstrate how to do basic troubleshooting with some common types of secure connections. If you are, then the server is not accepting secure connections on the specified port. If you receive this message, confirm you are using the correct server and port number. If this happens, you receive a message such as connect: Connection timed out or connect:errno=110. You can then send raw commands appropriate for the protocol you are testing. If this happens, openssl may display some text from the server, or simply await further input. When you try to establish a secure connection to a remote server using openssl, one of two things happens: Replace with the domain name (or IP address) of the server, and replace port with the TCP port number of the protocol you want to test: openssl s_client -connect : portįor a complete list of assigned TCP port numbers, please visit. To open a connection to a remote server, open a terminal window on your computer, and then type the following command. If you want to do more in-depth testing, however, you will need to know specific commands for the protocol you want to test (for example, IMAP or HTTP). If you are only testing basic connectivity to a particular application, that is all you need. The port number for the network application you want to test. To troubleshoot a secure connection using the openssl program, you must know at least two things: Using the openssl program to troubleshoot To run openssl, open a command prompt window, use the cd command to change to the folder where you extracted the files in step 5, and then type openssl.After you extract the files, the folder contains the openssl.exe file and supporting files.zip file to a folder (you can use any folder, and you can name the folder anything you want). For example, at the time this article is written, the newest version is openssl-1.0.2d-圆4_86-win64.zip. If you have a 64-bit computer, select a file whose name ends in win64.zip.For example, at the time this article is written, the newest version is openssl-1.0.2d-i386-win32.zip. If you have a 32-bit computer, select a file whose name ends in win32.zip.Download the most recent OpenSSL version for your PC architecture:.Click the OpenSSL for Windows hyperlink that includes Pre-compiled Win32/64 libraries without external dependencies.On Microsoft Windows, however, you must download and install openssl. Linux and Mac OS X include the openssl program by default. For information about how to do this, please see this article. To test non-secure connections, use the telnet program instead.
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