How to allow only certain Certificates

Hello,

how can I restrict access to my Apache to owners of certain individual=20
certificates?

I have tried the following (it doesn=B4t work, however):

SSLREQUIRE %{SSL_CLIENT_S_DN_UID} in {"<Subject Key Identifyer1>","<Subject=
=20
Key Identifyer2>",...}

where <Subject Key Identifyer> is the X509 extension Subject Key Identifyer=
of=20
the client=B4s certificate.
I tried it with colons and without.
The expression always results in false.

What is the corresponding value for SSL_CLIENT_S_DN_UID in a certificate?

Thanks

Harry
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