Can you try restart hostd service
/etc/init.d/hostd restart
/etc/init.d/vpxa restart
If its not helping follow the below steps.
1- Stop vCenter inventory service
2- Delete all content of C:\Program Files\VMware\Infrastructure\Inventory Service\data
3- Go to C:\Program Files\VMware\Infrastructure\Inventory Service\scripts\ and run createDB.bat
4- Run register.bat with your servername. register.bat fqdn 443
5- Start vCenter inventory service.
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