Shopify Fulfillment API hangs after processing first few orders

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Hello,

Shopify fulfillment API (/admin/api/2020-10/orders/{order_id}/fulfillments.json) hangs when we process more than 5-10 orders in loop. It process the first 5 orders and then hangs without any response. Any idea what could be the issue? We are noticing the same issue when we execute the below openSSL on our store URL. It gives response with certificate for the first 5 times and then it doesn't give any response and hangs. Is this issue related to any certificate issue?

 

openssl s_client -connect xxxxxxuk.myshopify.com:443 -showcerts

 

Sample response: 

1) No response and hangs after connected.... 

openssl s_client -connect xxxxxxuk.myshopify.com:443 -showcerts

CONNECTED(00000003)

 

2) Response with no certificate 

CONNECTED(00000003)

140632205186960:error:140790E5:SSL routines:ssl23_write:ssl handshake failure:s23_lib.c:177:

---

no peer certificate available

---

No client certificate CA names sent

---

SSL handshake has read 0 bytes and written 289 bytes

---

New, (NONE), Cipher is (NONE)

Secure Renegotiation IS NOT supported

Compression: NONE

Expansion: NONE

No ALPN negotiated

SSL-Session:

    Protocol  : TLSv1.2

    Cipher    : 0000

    Session-ID:

    Session-ID-ctx:

    Master-Key:

    Key-Arg   : None

    Krb5 Principal: None

    PSK identity: None

    PSK identity hint: None

    Start Time: 1605588695

    Timeout   : 300 (sec)

    Verify return code: 0 (ok)

 

3) Response with certificate:

CONNECTED(00000003)

depth=2 C = IE, O = Baltimore, OU = CyberTrust, CN = Baltimore CyberTrust Root

verify return:1

depth=1 C = US, O = "Cloudflare, Inc.", CN = Cloudflare Inc ECC CA-3

verify return:1

depth=0 C = US, ST = CA, L = San Francisco, O = "Cloudflare, Inc.", CN = *.myshopify.com

verify return:1

---

Certificate chain

0 s:/C=US/ST=CA/L=San Francisco/O=Cloudflare, Inc./CN=*.myshopify.com

   i:/C=US/O=Cloudflare, Inc./CN=Cloudflare Inc ECC CA-3

-----BEGIN CERTIFICATE-----

MIIEpTCCBEygAwIBAgIQCypVO9Wezorbf4Z879FquzAKBggqhkjOPQQDAjBKMQsw

CQYDVQQGEwJVUzEZMBcGA1UEChMQQ2xvdWRmbGFyZSwgSW5jLjEgMB4GA1UEAxMX

Q2xvdWRmbGFyZSBJbmMgRUNDIENBLTMwHhcNMjAwOTI5MDAwMDAwWhcNMjEwOTI5

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