In addition, there will be a Decrypted TLS tab at the bottom of the packet bytes view. Load the private key into Wireshark in PEM/PKCS format. I created a test site in a new windows server install and bound the certificate. I have extracted the key with openssl and removed the password. The certificate was created in IIS and exported to a PFX file. You can see undecrypted pcaps below before decryption. You will now notice packets containing the protocol under the TLS layer. How-to decrypt the SSL/TLS session with Wireshark Some TLS versions will allow you to decrypt the session using the server private key. I am able to decrypt traffic from another website with another key so I believe my wireshark settings are set to a working state. Wireshark now have both session keys and packets to decrypt SSL/TLS.For (Pre)-Master-Secret log filename, click Browse then select the log file you created for step (3).If you are using a previous version of Wireshark, navigate to SSL If you are using Wireshark 2.9 , navigate to the TLS protocol.In Wireshark, navigate to Edit and open Preferences. to create a new user variable and then fill out the dialog with the variable name SSLKEYLOGFILE and set the value to the file path you would like keys written to, e.g: C:\temp\sslkeylog.log. The protocol version is SSLv3, (D)TLS 1.0-1.2. From the Docs: The RSA private key file can only be used in the following circumstances: The cipher suite selected by the server is not using (EC) DHE. You can check for this in the handshake packet. This allows Wireshark to decrypt the traffic. When a Web Browser is configured to create and use this file all of the encryption keys created for that session are logged. This file is a feature provided by the web browser. On the System Properties dialog that appears, click Environment Variables In that case Wireshark cannot decipher SSL/TLs with a private key. Wireshark has the ability to use SSLKEYLOGFILE to decrypt https traffic.Therefore, I think the issue is related to the cipher chosen between my reverse proxy and the client system connecting to it. When I run wireshark on the content server, I am able to decrypt the traffic fine. In Windows, navigate to Control Panel > System and Security > System then click Advanced System Settings The server I am using Wireshark on is actually a reverse proxy which forwards requests on to a content server via HTTPS.Wireshark has the functionality to read the session keys from this file and use them to decrypt the TLS sessions. Applications like Mozilla Firefox and Google Chrome support symmetric session key logging to a file.
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