Siva,
If you are unable to open or login the support knowledge base, do the below, it should go away:
//Disable weak ciphers
a. Open Policy Manager and connect to gateway on port 9443
b. Tasks -> Manage Listen Ports -> Default HTTS (8443) -> SSL/TLS Settings -> Uncheck any checked ciphers with _DE_ or _DHE_ algorithm -> Ok -> Close
Please be careful that you do not want to un-check ECDHE or ECDH which are absolutely valid ciphers.
Alternate option can be, move the checked _DH_ and _DHE_ ciphers lower down in the list.
Both of them do the trick. Let me know how it goes.
Regards,
Trinath