我尝试使用 curl 从虚拟机 (centos) 调用多个 API 网关。
curl https://xxxx.execute-api.eu-central-1.amazonaws.com -v
这按预期工作，除了一个。
curl 调用在 ClientHello 之后挂起，直到超时。ServerHello 应该是下一个，但没有任何反应。
curl https://xxxx.execute-api.eu-central-1.amazonaws.com -v
* connected to xxxx.execute-api.eu-central-1.amazonaws.com port 443
* ALPN, offering h2
* APLN, offering http/1.1
* successfully set certificate verfiy locations
* CAfile: /etc/pki/tls/certs/ca-bundle.crt
* CAPath: none
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to xxxx.execute-api.eu-central-1.amazonaws.com:443
* Closing connection 0
在 TCP 级别，您可以看到 tcp_sync 和 tcp_ack 的 id 不匹配。
vm_client.48012 > api_gateway.https: Flags [S], seq 2805348193, win 29200, options [mss 1460,sackOK,TS val 919578686 ecr 0,nop,wscale 7], length 0
api_gateway.https > vm_client.48012: Flags [S.], seq 1879651467, ack 2805348194, win 26847, options [mss 1460,sackOK,TS val 88620492 ecr 919578686,nop,wscale 8], length 0
vm_client.48012 > api_gateway.https: Flags [.], ack 1, win 229, options [nop,nop,TS val 919578721 ecr 88620492], length 0
vm_client.48012 > api_gateway.https: Flags [P.], seq 1:518, ack 1, win 229, options [nop,nop,TS val 919578739 ecr 88620492], length 517
api_gateway.https > vm_client.48012: Flags [.], ack 518, win 110, options [nop,nop,TS val 88620506 ecr 919578739], length 0
api_gateway.https > vm_client.48012: Flags [P.], seq 4345:5332, ack 518, win 110, options [nop,nop,TS val 88620506 ecr 919578739], length 987
vm_client.48012 > api_gateway.https: Flags [.], ack 1, win 244, options [nop,nop,TS val 919578776 ecr 88620506,nop,nop,sack 1 {4345:5332}], length 0
vm_client.48012 > api_gateway.https: Flags [.], ack 1, win 244, options [nop,nop,TS val 919640456 ecr 88620506,nop,nop,sack 1 {4345:5332}], length 0
api_gateway.https > vm_client.48012: Flags [.], ack 518, win 110, options [nop,nop,TS val 88635940 ecr 919578776], length 0
vm_client.48012 > api_gateway.https: Flags [.], ack 1, win 244, options [nop,nop,TS val 919701898 ecr 88620506,nop,nop,sack 1 {4345:5332}], length 0
api_gateway.https > vm_client.48012: Flags [.], ack 518, win 110, options [nop,nop,TS val 88651295 ecr 919578776], length 0
vm_client.48012 > api_gateway.https: Flags [.], ack 1, win 244, options [nop,nop,TS val 919763339 ecr 88620506,nop,nop,sack 1 {4345:5332}], length 0
api_gateway.https > vm_client.48012: Flags [.], ack 518, win 110, options [nop,nop,TS val 88666654 ecr 919578776], length 0
vm_client.48012 > api_gateway.https: Flags [.], ack 1, win 244, options [nop,nop,TS val 919824781 ecr 88620506,nop,nop,sack 1 {4345:5332}], length 0
api_gateway.https > vm_client.48012: Flags [.], ack 518, win 110, options [nop,nop,TS val 88682014 ecr 919578776], length 0
这里出了什么问题，我怎样才能更接近真正的问题？你有什么想法？
虚拟机上的防火墙已关闭。