dog tag (Error code: sec_error_reused_issuer_and_serial)

After I remove dogtag instance and rebuild again, suddenly I cannot access web gui dog tag, in firefox it say the certificate number is same but cannot verify this certificate please ask new certivicate.

find certificate db at firefox

[root@ketoprak ~]# locate cert8.db
/etc/dirsrv/admin-serv/cert8.db
/etc/dirsrv/slapd-ketoprak/cert8.db
/etc/httpd/alias/cert8.db
/etc/pki/nssdb/cert8.db
/root/.dogtag-idm-console/cert8.db
/root/.mozilla/firefox/lirlvw2m.default/cert8.db
/var/lib/pki-ca/alias/cert8.db
/var/lib/pki-kra/alias/cert8.db
/var/lib/pki-ra/alias/cert8.db
/var/lib/pki-tps/alias/cert8.db

delete the certificate

[root@ketoprak ~]# rm -rf /root/.mozilla/firefox/lirlvw2m.default/cert8.db

restart firefox, and try to access dogtag web gui again.

reference:
 http://saltwetbytes.wordpress.com/2009/09/14/firefox-issues-error-sec_error_reused_issuer_and_serial/