Certificate-Not-Sent/EN
Verification of certificate transmission
If the result is positive, there is no need for further action. If the result is negative, please read the following instructions.
| Result positive | Server sends a certificate |
| Result negativ | Server does not send a certificate |
| Description | The server has not sent a certificate. This is unusual and should not occur. The server should check its TLS configuration and, if necessary, disable anonymous cipher suites. |
| Background | It is theoretically possible to configure a TLS server so that it will not send a certificate to identify itself and only encrypt without signing its public key. A client that wants to connect to the server cannot check whether it is really communicating with the server it expects. This type of configuration is very rare. |
| Consequence | Without a certificate for your website, attackers can listen in on your communication. Criminals could intercept your customers' personal data, such as passwords or credit card information. |
| Solution/Tips | If Server does not send a certificate was reported, urgently update your TLS implementation. Current software no longer allows this type of configuration. |