I could solve the problem by using uemcli and deleteing the old X.509 VASA cetificate
Hi,  Last year in first registeration of VASA between vcenter server 6 and emc unity 300 a certificate has been created and assigned for VASA use on EMC .. [URL] Now it's expired and so the registration is broken and failed. changing Unity IP address or hostname renews the management service certificate renewed but no effect on VASA service address. It's still using the old certificate And I cannot find a way to renew the certificate .. stil the old one issued by EMC and expired ..  any help would be greatly appreciated.  Thanks
VASA Povider certificate expired - Unity 300 inaccessible