Just thought I could share the solution for updating the VCSA / vCenter certificate after the DST Root X3 expired on September 30, 2021. The trick is to correctly chain the vCenter Machine SSL and the Chain of trusted root certificates as vCenter is very picky with the format. Check out this guide here > Replace Default vCenter Certificate with a Free Let's Encrypt SSL - VirtuallyWired
It might be worth mentioning I've also updated my script to support the ISRG Root X1 which can automate the Let's Encrypt Cert replacement directly to vCenter. Credit to Credit to @rmbolger for the Posh-ACME Module. Automate Free SSL Certificate Replacement for vCenter 7 - VirtuallyWired
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