The “DecodeError” alert in TLS (Transport Layer Security) typically means that there was an issue with interpreting the messages sent during the TLS handshake. It can happen due to a few reasons:
Incompatibility between the TLS versions or cipher suites used by the client and the server.
A corrupted or malformed message received during the TLS handshake process.
A misconfiguration on either the client side or server side causing issues with the TLS handshake.
To resolve this issue, you can try the following solutions:
Verify the configuration: Check both the client-side and server-side configurations for any errors or inconsistencies in the TLS version, cipher suites, or other security settings. Correct any discrepancies that you find.
Update software: Update your client software (web browser, email client, etc.) and server software to the latest stable versions, which might include fixes for known TLS issues.
Check network devices: Ensure that there are no network devices, such as firewalls or proxies, interfering with the TLS handshake by blocking specific ports or modifying messages.
Debugging: Enable SSL/TLS debug logs in your application or use third-party tools such as Wireshark to analyze the TLS handshake process and pinpoint the exact cause of the DecodeError. This information can help you determine if there are any specific configurations or issues that need to be addressed.
Note that troubleshooting TLS issues can be complicated due to the involvement of encryption and various security mechanisms. If you consistently face this issue and are unable to resolve it yourself, consider reaching out to your server administrator or the support team for the software you are using for assistance.
For robot connection, we recommend using only TLS 1.2, and disable TLS 1.0, TLS 1.1, and TLS 1.3.