I received that error:
ConnectionError: HTTPSConnectionPool(host='acme-v02.api.letsencrypt.org', port=443): Max retries exceeded with url: /directory (Caused by SSLError(SSLError(0, u'unknown error (_ssl.c:3063)'),)
My ip adress is 172-31-12-121 .
Can you help me please? thank you!
Hello @oitotech, welcome to the Let's Encrypt community. 
A great place to start debugging Let's Encrypt certificates is Let's Debug
Here is the information on Rate Limits - Let's Encrypt
@Bruce5051 This is an error when the client tries to connect to the ACME server to begin with.
However, an "unknown error" is not very helpful and also not one I've seen before. I would advice @oitotech to use tools like openssl s_client and/or curl to debug outgoing connections in general.
And what is the real Internet IP?
IP 172.31.12.121 is within RFC 1918 block 172.16.0.0/12
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