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This CMP capable CA allows convenient public evaluation. It listens at http://izac.de:4711 for certificate requests.
The needed CA certificate is already included in the 'certs' folder of the downloadable source package.
If you are using an HTTP proxy not able to keep persisting connections, completing the IR and KUR sequences is not possible with this server so far.
Only four simple steps are needed to evaluate the CMP for OpenSSL client:
Wireshark dissects CMPv2 messages since version 0.99.7, using a recent SVN snapshot is recommended.