We would like to remind you that on 12 May 2026 at 15:00, the authentication certificate CN = CS OTE auth will be renewed in the PROD environment.

This change applies to participants using automated communication with CS OTE, in particular SOAP web services, WS-Security, verification of response signatures, and TLS authentication in the direction OTE → participant.

Please verify that the new certificate will be trusted and correctly processed in your systems.

The new certificate is available here.