Methods for Extracting SSL thumbprint from ESXi

Method 1:- DCUI

Method 2:- ESXi Shell/SSH
openssl x509 -in /etc/vmware/ssl/rui.crt -fingerprint -sha1 -noout

Method 3:-vMA (vSphere Management Assistant)
echo -n | openssl s_client -connect 172.30.0.252:443 2>/dev/null | openssl x509 -noout -fingerprint -sha1

Source:-
http://www.virtuallyghetto.com/2012/04/extracting-ssl-thumbprint-from-esxi.html