Curl: (56) OpenSSL SSL_read: SSL_ERROR_SYSCALL, errno 104

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[root@in1 ~]# curl -v 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/pki/tls/certs/ca-bundle.crt
  CApath: none
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, [no content] (0):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, [no content] (0):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, [no content] (0):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, [no content] (0):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, [no content] (0):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* ALPN, server accepted to use h2
* Server certificate:
*  subject: CN=acme-v02.api.letsencrypt.org
*  start date: Jul  2 23:44:42 2024 GMT
*  expire date: Sep 30 23:44:41 2024 GMT
*  subjectAltName: host "acme-v02.api.letsencrypt.org" matched cert's "acme-v02.api.letsencrypt.org"
*  issuer: C=US; O=Let's Encrypt; CN=R11
*  SSL certificate verify ok.
* Using HTTP2, server supports multi-use
* Connection state changed (HTTP/2 confirmed)
* Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
* TLSv1.3 (OUT), TLS app data, [no content] (0):
* TLSv1.3 (OUT), TLS app data, [no content] (0):
* TLSv1.3 (OUT), TLS app data, [no content] (0):
* Using Stream ID: 1 (easy handle 0x555cc424c620)
* TLSv1.3 (OUT), TLS app data, [no content] (0):
> GET /directory HTTP/2
> Host: acme-v02.api.letsencrypt.org
> User-Agent: curl/7.61.1
> Accept: */*
>
* OpenSSL SSL_read: SSL_ERROR_SYSCALL, errno 104
* Failed receiving HTTP2 data
* TLSv1.3 (OUT), TLS app data, [no content] (0):
* SSL_write() returned SYSCALL, errno = 32
* Failed sending HTTP2 data
* Connection #0 to host acme-v02.api.letsencrypt.org left intact
curl: (56) OpenSSL SSL_read: SSL_ERROR_SYSCALL, errno 104
2

What types of firewall/IPS rules are in use?

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