after re-install the ESXi 5.5 OS on cisco UCS blade, unable to ping ESXI management network and join to the vcenter

Issue: re-installed the ESXi 5.5  on cisco UCS blade and after that the ESXi management IP was not pinging and not able to connect it to vcenter.

finding:

up on checking the esxi configuration, found that somehow vmk0 mac address of the issue ESXi host  is same as physical mac address of other production ESXi host mac address and because of this  mac-address conflict, I was unable to ping the management IP. usually vmk0 mac-address would be automatically generated by ESXi (00:50:56:xx:xx:x)

Solution:

deleted, the vmk0 configuration as below  and created again and now the ESXi generated the VMware mac-address and now I'm able to ping the ESXi host management IP.
refer to: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1031111 



esxcfg-vmknic -d -p 'Management Network' this command could delete all the vmknic on management network port group



 00:50:56:xx:xx:xx mac address automatically assigned to vmk0

Unable to Add roles and features on Windows 2012 server ( Server manager is collecting inventory data. The wizard will be available after data collection finishes

Issue: after I build Windows 2012 server and delivered to Application team, application tried to add IIS role on windows 2012 server and suddenly noticed that they cannot add any roles due to when they click add roles and features button on server manager, it shown as below






and when I refereshed the manager, it shown below error refresh failed



quick Fix: 

open command prompt with admin rights and execute as below


cd C:\Windows\System32\wbem\AutoRecover

for /f %s in ('dir /b *.mof *.mfl') do mofcomp %s

 



once execute it, it would automatically recover all the mof file as below

that it, now you are free to do anything on server