While you attempt to register Cisco UCS Manager domains with Cisco UCS Central, you find that it is failing. Which three options are possible causes for the failure between the Cisco UCS Manager domain and Cisco UCS Central? (Choose three.) 

Answer options:

A. TCP packet loss
B. using the IP address of the Cisco UCS Manager domain instead of the FQDN
C. version mismatch
D. incorrect default policy configured in Cisco UCS Central
E. incorrect shared secret
F. date and time mismatch

BEF

Reference: https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/ucs-central/deployment-guide/1-0/b_UCSC_Deployment_Guide_10/ b_UCSC_Deployment_Guide_10_chapter_0100.html