What does "Could not convert socket to TLS" mean in the context of Keycloak's Email Test Connection?

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This error message suggests that Keycloak was unable to establish a secure connection with the email server because the socket could not be converted to Transport Layer Security (TLS). This could be due to a configuration issue with the email server or a mismatch between the TLS settings of Keycloak and the email server. It is recommended to check the TLS settings of both Keycloak and the email server and ensure they are compatible. Additionally, ensuring that the certificate used by the email server is valid and trusted by Keycloak may also resolve the issue.