When troubleshooting Azure VPN connections, what does a certificate warning during a health probe indicate?

A certificate warning during a health probe in Azure VPN connections typically indicates that there may be an issue with the certificate being used for authentication or encryption, rather than suggesting that the VPN is fully operational. In this context, a certificate warning usually highlights a misconfiguration, such as an expired certificate, a certificate that is not trusted, or discrepancies in the certificate chain.

When troubleshooting, it's crucial to recognize that the presence of a certificate warning can impede the establishment of a secure connection, which is fundamental to the operation of a VPN. In contrast, seeing a health probe pass without any certificate warnings would confirm that the VPN is functioning correctly and securely. Therefore, the correct response aligns with understanding that a certificate warning signifies an operational issue rather than confirming full functionality.