While accessing  VMware vCenter Server Appliance  (vCSA), sometimes we find the error message ” Failed to connect to VMware Lookup Service https://vcenterhost:7444/lookupservice/sdk – SSL certificate verification failed” . If this message occurs , we can not log into vCSA . This message usually occurs when we change the IP or hostname of the vCenter without regenerating SSL certificate.
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To manage this problem, we can ask vCSA to regenerat SSL certificate to meet with new IP or hostname. Login to vCSA admin page (eg : https://vcenter-lab.excellent.co.id:5480) then select the Admin menu and select the option Enabled Certificate Regeneration. Once completed, go to the System menu tab and select reboot vCenter .
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While restart, vCenter will regenerate  SSL certificate and then continue starting other services . Once completed , we can access the web client vCSA as usual . Do not forget to refresh your browser so that the browser detects a new SSL certificate.

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