Ploblem with connections to acme-v02.api.letsencrypt.org

Help
1

I’m represented hosting company and we and our’s clients has problem with connections to acme-v02.api.letsencrypt.org.

It’s manifests itself after a connection with https://acme-v02.api.letsencrypt.org is establish. Connection is closed with error ECONNRESET or receive timeout after 30-60 second (it’s our connection).

bash-4.4# curl -vvv https://acme-v02.api.letsencrypt.org/directory
*   Trying 172.65.32.248...
* TCP_NODELAY set
* Connected to acme-v02.api.letsencrypt.org (172.65.32.248) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/certs/ca-certificates.crt
  CApath: none
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
* LibreSSL SSL_connect: SSL_ERROR_SYSCALL in connection to acme-v02.api.letsencrypt.org:443 
* Closing connection 0
curl: (35) LibreSSL SSL_connect: SSL_ERROR_SYSCALL in connection to acme-v02.api.letsencrypt.org:443

Address of client machine is irrelevant. I’m tested this problem from another internet provider and it’s is confirmed.

$ curl -vvv https://acme-v02.api.letsencrypt.org/directory                                                                                                                 20-04-28 12:32 ⌛
* Expire in 0 ms for 6 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
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* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
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* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 0 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 2 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
* Expire in 1 ms for 1 (transfer 0x55cf5e8195c0)
*   Trying 172.65.32.248...
* TCP_NODELAY set
* Expire in 200 ms for 4 (transfer 0x55cf5e8195c0)
* Connected to acme-v02.api.letsencrypt.org (172.65.32.248) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: none
  CApath: /etc/ssl/certs
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to acme-v02.api.letsencrypt.org:443 
* Closing connection 0
curl: (35) OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to acme-v02.api.letsencrypt.org:443

We confirmed it’s with dehydrated and our hame API client

2

Could you also include one of the affected ranges and also provide a traceroute?

3

This traceroute from our task worker with client of Acme API:

bash-4.4# traceroute acme-v02.api.letsencrypt.org
traceroute to acme-v02.api.letsencrypt.org (172.65.32.248), 30 hops max, 46 byte packets
 1  10.12.1.119 (10.12.1.119)  0.119 ms  0.148 ms  0.120 ms
 2  10.12.0.2 (10.12.0.2)  0.172 ms  0.205 ms  0.197 ms
 3  10.100.0.100 (10.100.0.100)  0.180 ms  0.221 ms  0.176 ms
 4  spx-ix.as13335.net (194.226.100.129)  32.776 ms  32.893 ms  42.212 ms
 5  *  *  *
 6  *  *  *
 7  *  *  *
 8  *  *  *
 9  *  *  *
10  *  *  *
11  *  *  *
12  *  *  *

My laptop’s IP in range 94.140.137.0/24 and this traceroute from him (MTS.RU):

1  _gateway (192.168.1.1)  1.325 ms  1.244 ms  1.178 ms
 2  10.140.0.1 (10.140.0.1)  2.741 ms  2.700 ms  2.641 ms
 3  85-235-63-32.rev.utk.ru (85.235.63.32)  2.638 ms  2.651 ms  2.694 ms
 4  zoo-cr01-be19.ekt.mts-internet.net (212.188.18.128)  4.474 ms  4.443 ms  3.067 ms
 5  pob-cr02-be7.66.kaz.mts-internet.net (212.188.29.85)  19.007 ms  19.017 ms  18.959 ms
 6  mag9-cr01-be6.16.msk.mts-internet.net (195.34.50.161)  30.749 ms  29.714 ms  30.182 ms
 7  m9-cr04-be8.77.msk.mts-internet.net (212.188.54.213)  30.682 ms  30.437 ms  30.872 ms
 8  m9-cr05-ae3.77.msk.mts-internet.net (195.34.53.185)  30.786 ms  30.791 ms  30.756 ms
 9  172.68.8.254 (172.68.8.254)  52.316 ms  56.402 ms  56.389 ms
10  * * *
11  * * *
12  * * *
13  * * *
14  * * *

One of our client that detected error with dehydrated is resdented in network 45.86.183.0/24

P.S. Last registered error in API at 28 April 2020 г. 11:16:51 UTC
P.S.2. It’s periodical error: from one to four errors per 10min.

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