When I try to upgrade my 4.1 vCenter Server I get an error before the upgrade starts. The Fully Qualified Domain Name cannot be resolved. If you continue the installation, some features might not work correctly. For detailed requirements, see the vSphere Installation and Setup guide.
I can ping my vCenter server using the FQDN and I can also run NSLOOKUP on this server and all reports back fine. What am I missing and what wouldn't work if I ignored the error and continued on with the install?
Thanks,
John