I’m investigating using a Let’sEncrypt multi-domain cert where I was previously using a wildcard cert from another provider. What I’m finding is that when I add 1 new domain to the list of valid domains, that the time it takes Let’sEncrypt to re-authenticate all the existing domains is quite long, whereas the part of the time taken for the new domain is only a few seconds.
For example, if each domain takes 5 seconds to authenticate:
- We have an existing Let’sEncrypt cert for 90 domains which have all been successfully authenticated
- We want to add one new domain
- Let’sEncrypt re-authenticates all 90 domains plus the new 1
- Time taken is 455 seconds
Is there any way to configure the cert request such that only the 1 new domain needs to be authenticated and so the cert request only takes the shorter 5 seconds?