I need to use Apache HTTPD in a reverse proxy configuration, with HTTPS connections to the backend servers. The problem is that the backend servers must use ECDSA certificates using Brainpool curves, which are not enabled by default in OpenSSL. When using HTTPD as the server, I can enable the needed Brainpool curves using the SSLOpenSSLConfCmd directive (e.g. SSLOpenSSLConfCmd Curves brainpoolP384r1:brainpoolP256r1) but currently there is no such options to configure proxy connections where mod_ssl acts as the TLS client. Because of this mod_ssl always rejects the server certificate, even with the default "SSLProxyVerify none" setting. In line with the existing directives I'm proposing a SSLProxyOpenSSLConfCmd directive to solve that problem. I've made a pull request on Github: https://github.com/apache/httpd/pull/105 This works for me as is, but I'm happy to make adjustments if requested.