If you capture network packet using Wireshark, Netmon or tcpdump, you can open the file in Wireshark.

(Client and server starts their own secret conversation encrypted with their agreed secret key which I don't even understand…)īelow is a real example showing how it looks like in network packet.

This step may be vary for different ciphers ) Both server and client use the Master key for following message encryption and decryption.

Server replies 'Let's encrypt using our own secret key and let's get our secret conversation start now!' (Normally server and client generate another key so called Master Key using the secrete key and agreed algorithm.

So yes server is able to decrypt the secret key.

The message sent from client can be only decrypted using server's private key which is known by server only and cannot be peeked by others.

Client says 'Alright let's use you picked cipher, here is secret key I encrypted with your public key.

Once verification passed, client creates a random secret and encrypt with server's public key (derived from server certificate).

Client review server's certificate, verify if the certificate is expired, if it is issued to the same server name client tried to access, if the certificate issuer is trustable, or if the certificate is ever revoked, etc.

By the way here is my certificate (certificate chain) with my public key for you to check my identity.'

Let's use this TLS version and CipherSuite.

Server replies 'Hello back, we can use the TLS version you sent and I find this CipherSuite from your list on my hand as well.

Server checks if itself supports same TLS version and go through server's own CipherSuite lists to see if there is any matching ones.

Here is my TLS version and a list CipherSuite I have on my hand. Client says 'Hello, I would like to talk to you secretly by encrypting the messages.

It is always client that starts a conversation.

I know there are millions of articles out there explaining the same handshake process using different colors, styles and arrows, so here comes my version: In this article we will discuss common causes of TLS related issue and troubleshooting steps.īefore we start, let us get to know how SSL/TLS connections are established. A typical ones such as 'Could not create SSL/TLS secure channel.' 'SSL Handshake Failed', etc. Exceptions are vary dramatically depending on the client and server types. You may experience exceptions or errors when establishing TLS connections with Azure services. Nowadays almost every service support connection over TLS to encrypt data in transit to protect data.

Office 365 troubleshooting guide