IPA CLI and Web UI Interfaces Each Return Error -8015 When Performing Certificate Operations

Issue

Both the IPA command-line and Web UI interfaces return '[Errno -8015] error (-8015) unknown' when we attempt to manage certificates:

# ipa cert-show 20120424033757
ipa: ERROR: cannot connect to 'https://ipaserver01.example.com:443/ca/agent/ca/displayBySerial': [Errno -8015] error (-8015) unknown

In addition, the certmonger daemon has not been able to complete certificate operations against the IPA CA due to a problem with decoding certificate signing requests :

 # ipa-getcert list
Request ID '20120424033757':
    status: CA_UNREACHABLE
    ca-error: Server failed request, will retry: 4301 (RPC failed at server.  Certificate operation cannot be completed: Failure decoding Certificate Signing Request).
    stuck: yes
    key pair storage: type=NSSDB,location='/etc/pki/nssdb',nickname='IPA Machine Certificate - ipaclient01.example.com',token='NSS Certificate DB'
    certificate: type=NSSDB,location='/etc/pki/nssdb',nickname='IPA Machine Certificate - ipaclient01.example.com',token='NSS Certificate DB'
    CA: IPA
    issuer: CN=Certificate Authority,O=EXAMPLE.COM
    subject: CN=ipaclient01.example.com,O=EXAMPLE.COM
    expires: 2014-04-25 03:37:58 UTC
    eku: id-kp-serverAuth,id-kp-clientAuth
    pre-save command: 
    post-save command: 
    track: yes
    auto-renew: yes