Let's Encrypt certificate

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rich T

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Mar 3, 2020, 6:26:08 PM3/3/20
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John Kline

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Mar 3, 2020, 6:50:50 PM3/3/20
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Q: How do I know if I’m using an affected certificate?
A: Here is an online tool that will show you: https://checkhost.unboundtest.com/ 1.8k

Or, on a Linux/BSD-like system, this command will show you example.com's current certificate serial number:

openssl s_client -connect example.com:443 -servername example.com -showcerts </dev/null 2>/dev/null | openssl x509 -text -noout | grep -A 1 Serial\ Number | tr -d :

You can see the list of all affected serial numbers at: https://letsencrypt.org/caaproblem/ 


On Mar 3, 2020, at 3:26 PM, rich T <storm...@gmail.com> wrote:


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Brice Ruth

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Mar 4, 2020, 10:32:59 AM3/4/20
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Also, no harm in just running certbot renew with --force-renewal. No guess work, you'll get a new cert that is guaranteed not affected.

Brice Ruth, FCD
Software Engineer, Madison WI


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