Client Authentication with Comodo Free SSL

I want to test the client authentication with Comodo free before i buy it. The server certificate ist installed in Apache 2.064 and worked. I have created an e-mail certificate and installed it in firefox. Now i want to run my site but it refuses my client key with the following error message:

SSL3_GET_CLIENT_CERTIFICATE:peer did not return a certificate No CAs known to server for verification?

My ssl.conf:

SSLEngine On
SSLProtocol all
SSLCertificateFile c:/comodo/mydomain_de.crt
SSLCertificateKeyFile c:/comodo/mykey.pem
SSLCertificateChainFile c:/comodo/

SSLVerifyClient require
SSLVerifyDepth 10
SSLOptions +StdEnvVars +ExportCertData

Is it not possible with a free account or what is wrong? Please help!!!

Is client authentication also possible with a free ssl certificate from comodo?

I merged your two topics with the same question for the obvious reason.

Client auth is not on the Free Email Certificate but I do believe t is on the SSL certificate.

thanks for your reply.

can someone confirm that client authentication is possible with comodo basic ssl or the two factor authentication?
then i will buy it!

All paid SSL certificates from Comodo have both Client Authentication and Server Authentication as key usages.