Unable to migrate Virtual Center to 6.5 from 5.5. Certificate errors.

Easy one

Uninstall VCenter Server from Windows

Copy/Backup and  Remove

C:\ProgramData\VMware\VMware VirtualCenter\SSL

Reinstall same Virtual Center that was installed before.

Or you can follow this great blogg from Zlatko Mitev

vCenter Self-Signed Certificates – Part 1

Some notifcation from me:

OpenSSL 0.9.8 is requried
http://gnuwin32.sourceforge.net/packages/openssl.htm

Deploying and using the SSL Certificate Automation Tool 5.5
http://kb.vmware.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&docTypeID=DT_KB_1_1&externalId=2057340

#When you are running openssl 0.9.8 you can go past 2037 or something so you need to change -days to something smaller
openssl x509 -req -days 1300 -sha256 -in c:\tmp\rui.csr -signkey c:\tmp\rui.key -out c:\tmp\rui.crt -extensions v3_req -extfile c:\tmp\openssl_config.cfg

#For me Openssl 0.9.8 did not work so I used the openssl version from C:\Program Files\VMware\Infrastructure\Inventory Service\bin
openssl.exe pkcs12 -export -in c:\tmp\rui.crt -inkey c:\tmp\rui.key -name rui -passout pass:testpassword -out c:\tmp\rui.pfx