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The openssl verify utility can be used to verify certificates against known CAs, as discussed in this how to.

In order to verify the certificate acs.qacafe.com.pem included with CDRouter using the openssl verify utility, you must also specify the intermediate CA (acs.qacafe.com-ca.pem) using the -untrusted option:

# openssl verify -untrusted acs.qacafe.com-ca.pem acs.qacafe.com.pem
acs.qacafe.com.pem: OK

Note that the intermediate CA acs.qacafe.com-ca.pem is signed by VeriSign and can be found in the /usr/share/doc/cdrouter directory along with the acs.qacafe.com.pem certificate.

Related articles that may also be helpful:

• What root certificate must be installed to verify acs.qacafe.com.pem?
• How do I display the contents of a SSL certificate?
• How do I use my own certificates for CDRouter's ACS?
• What should I check if I do not receive an initial Inform from CPE?
• Should the periodic Inform be enabled or disabled?