When I try to connect LDAP server with Directory certificate installed in Onboard Administrator , I get the below error message. Initiating Directory Settings diagnostic for LDAP server 10.0.0.2 port 636

10.0.0.2Accepting Directory Server certificate for /CN=qtp-ldap.oaqtp.com signed by /DC=com/DC=oaqtp/CN=qtp-ldap
Skipping certificate 1 (/CN=qtp-ldap.oaqtp.com): subject issuer mismatch 
Certificate of Directory Server cannot be verified with the installed LDAP certificate. 
Unable to establish SSL connection with directory server. 
You may need to install a certificate for your server to allow SSL connections. 

It says "Subject Issuer mismatch" .. What could be the reason ?

-Shibi Keyan