Test email alert fails with Error "Failed to send notification - handshake_failure(40)" for MS Power Automate Webhook in VMware Aria Operations for Logs.

Products

• VCF Operations/Automation (formerly VMware Aria Suite)

Issue/Introduction

In VMware Aria Operations for Logs, attempting to send a test email alert or notification via a Microsoft Power Automate webhook fails. The UI display the following error message:
Failed to send notification - handshake_failure(40).

Test performed

• openssl s_client -connect <MS_PowerAutomate_FQDN>:443 --> This commands returns certificate.
• openssl s_client -connect <MS_PowerAutomate_IP_address>:443 -tls1_2 --> This commands fails to return certificate.
• openssl s_client -connect <MS_PowerAutomate_IP_address>:443 -servername <MS_PowerAutomate_FQDN> --> This commands returns certificate.
  

Environment

VMware Aria Operations for Logs 8.18.6 and earlier

Cause

The Power Platform endpoint requires Server Name Indication (SNI) to present the correct SSL/TLS certificate. The client in Aria Operations for Logs does not currently send the SNI extension during the TLS handshake. When the connection is established without SNI, the server fails to provide a certificate and terminates the connection with a handshake failure.

Resolution

This reported issue has been marked as a bug and targeted to be fixed in the next patch release of Aria Operations for Logs 8.18.x.