3Com 3C13636 Configuration Manual page 1197

3Com Router 3000 Ethernet Family
Configuration Guide
1) Software problems
No local certificate exists when you try to retrieve a CRL.
IP address of LDAP server is not configured.
CRL distribution point location is not configured.
LDAP server version is wrong.
2) Hardware problems
Network connection faults, such as broken network cable and loose interface.
3Com Corporation
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Chapter 9 PKI Configuration