Frequently Asked Questions (FAQ)

Documentation
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Please see https://letsencrypt.org/docs/faq/ for Frequently Asked Questions about Let’s Encrypt.

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How to get a certificate?
Two unrelated domains on one server
When to generate Certs again?
Revoke all Certificates?
Raspberry Pi compatibility
Simple and Clear Directions
New validation IP addresses
S/MIME certificates
Developer Certs
Wanna Try Letscrypt on my Server
Letsencrypt's validity duration affecting SE ranking?
Completing A Challenge when DNS is Globally Load Balanced (Multiple DNS Entries Per Domain)
User Certs on Let's Encrypt
Will you allow overlapping certificate requests?
Certbot/Letsencrypt authenticator IP addresses
Web hosting production workflow
Will Let's Encrypt honor reasonable bits in the CSR for Free/Open Source projects?
PKCS #12 certificates to be used with MassCert
FAQ page not prepared for questions
FAQ on forum is a bit outdated
Update link in the FAQ please
Idea for improving the FAQ
Certbot-auto fails with python backtrace
Response to Inaccurate Customer Support Email
Better help requests through topic templates
Update link in the FAQ please
Python setup.py egg_info failed with error code 1
FAQ page not prepared for questions