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See server SSL cert on connection?

Printed From: Rocket Software
Category: AccuTerm Knowledge Base (read only)
Forum Name: Connectivity
Forum Description: Questions about serial, modem, telnet and secure shell connections?
URL: https://forum.asent.com/forum_posts.asp?TID=2739
Printed Date: March 28 2024 at 1:30pm
Software Version: Web Wiz Forums 12.03 - http://www.webwizforums.com


Topic: See server SSL cert on connection?
Posted By: TonyG
Subject: See server SSL cert on connection?
Date Posted: January 29 2021 at 9:22am
Once in a while I need to test a server with Telnet or SSH. For example, an HTTP server, SMTP, POP3, or IMAP where port 993=SSL. Of course I prefer to use AccuTerm! :)

On connection with SSL, a server will send out its SSL certificate during the handshake process. When the handshake is complete, we get the user-oriented interface, with "OK" or other RFC-compliant response.

Is there a Setting in AccuTerm to use to see that data? Or, do we need to us a Debug version?

As an example, from an OS CLI "openssl s_client -connect server:port". You should see at least the cert and TLS data. That's what I'd like to see in AccuTerm.

Thanks!

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Tony Gravagno Nebula Research & Development
TG@ Nebula-RnD . com
http://Nebula-RnD.com/blog
http://Twitter.com/TonyGravagno
http://groups.google.com/group/mvdbms
https://www.linkedin.com/groups/64935



Replies:
Posted By: TonyG
Date Posted: February 03 2021 at 2:34pm
EDIT: I just noticed that I am running the debug version of 8.0.1020.

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Tony Gravagno Nebula Research & Development
TG@ Nebula-RnD . com
http://Nebula-RnD.com/blog
http://Twitter.com/TonyGravagno
http://groups.google.com/group/mvdbms
https://www.linkedin.com/groups/64935


Posted By: PSchellenbach
Date Posted: February 03 2021 at 5:32pm
Hi Tony - thanks for the question. I looked at this and I don't think you can use AccuTerm (telnet) to connect to https server to view the certificate details. AccuTerm's SSL/Telnet connection is a telnet session conducted within an SSL connection. I tried using that connection type to a normal web server running SSL, and even using the debug version, there is really not much useful information available. The actual SSL handshake appears to be exchanging binary data so OpenSSL is probably your best option.

I actually used AccuTerm's telnet to install DD-WRT on an old router last weekend. The main tricks were to select the Binary option, Skip initial options, and Half Duplex.

Thanks, Pete



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