Two areas to consider when joining the vsphere vCenter to the AD domain and experiencing error code 2453
verify that the vCenter is able to resolve both IPv4 and IPv6 if IPv6 is left as enabled. If IPv6 is not used, but configured on DNS this may result in failure to resolve while authenticating to the AD domain. Second, enter the FQDN for the domain, but do not enter the FQDN after the user ID used to authenticate to the domain (i.e. Administrator not Administrator@domain.com).
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