I am using Free Pascal 3.2.2 on Win64 with Synapse downloaded on June
22, 2024.
Synapse TTCPBlockSocket are used for both the server and client.
On the server, after a tcp connection is connected, it will call
TTCPBlockSocket.SSLAcceptConnection repeatedly to try to accept a
TLSv1.3 connection. The server is not assigned any certificate, so an
ad-hoc certificate will be used.
On the client, after a tcp connection is connected, it will call
TTCPBlockSocket.SSLDoConnect to establish TLSv1.3 connection.
The Server PC is running windows 10 64-bit while the client is running
windows 11 64bit.
I encountered a very weird situation:
When Server PC and Client PC are on the same LAN, the TLSv1.3 connection
will take around 5 seconds to establish.
However, when the Server PC and Client PC are separated by the internet,
it will take ONLY 0.05 second to establish
I check the SSL settings reported by synapse and they seem normal as
follows:
24-07-16 16:13:33.442 24-07-16 16:13:33.442 TTCPBlockSocket.LastError:#0
24-07-16 16:13:33.690 24-07-16 16:13:33.690 SSL Establishment took
,Duration=0.04 Seconds
24-07-16 16:13:33.690 24-07-16 16:13:33.690
TTCPBlockSocket.SSL.GetSSLVersion:TLSv1.3
24-07-16 16:13:33.690 24-07-16 16:13:33.690
TTCPBlockSocket.SSL.SSLType:LT_all
24-07-16 16:13:33.690 24-07-16 16:13:33.690 TTCPBlockSocket.SSL.CertCA:''
24-07-16 16:13:33.690 24-07-16 16:13:33.690 TTCPBlockSocket.SSL.GetCertInfo:
Data:
Version: 3 (0x2)
Serial Number: 271214215 (0x102a6687)
Signature Algorithm: sha256WithRSAEncryption
Issuer: C=CZ, CN=203176212158.ctinets.com
Validity
Not Before: Jul 15 08:13:33 2024 GMT
Not After : Sep 14 08:13:33 2024 GMT
Subject: C=CZ, CN=203176212158.ctinets.com
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
Public-Key: (2048 bit)
Modulus:
00:d2:31:1e:1b:5f:88:d5:d9:4a:eb:8a:a4:7d:62:
56:7d:2f:fd:4a:14:53:46:67:cb:8e:3f:6f:7d:10:
d1:34:57:1f:1e:10:fd:08:0e:47:0b:46:36:68:ae:
ee:b1:33:84:21:68:02:4e:ed:22:4f:19:a1:34:b6:
74:1e:4f:1a:65:83:20:fb:fb:4f:8f:50:3b:58:76:
88:5a:c2:97:71:28:c8:91:fb:5f:cd:d5:a8:cd:db:
b4:4a:15:87:ce:d3:96:9d:9e:9f:98:54:9f:3c:22:
0e:8b:3b:04:9f:da:b2:00:e0:c6:fc:9d:25:5a:83:
69:f3:fe:a6:22:d1:14:da:98:d2:f3:b2:cb:2b:1b:
10:98:79:34:6d:44:8a:fc:1c:8b:9a:e8:2e:56:f9:
25:c4:f6:b4:ab:4d:b9:d5:64:e4:41:8e:89:b5:2f:
b8:e0:86:68:ba:ad:8e:0f:a1:cf:b4:72:e0:5f:ad:
e4:d9:22:0b:65:17:a5:26:06:82:99:67:0d:73:d4:
98:5e:32:01:4d:57:58:dd:ad:fa:cc:a0:27:e3:d1:
91:c2:86:d2:90:c2:b4:92:30:6f:02:d8:5f:e9:ed:
78:5b:e4:00:c7:c0:4b:79:a7:29:40:2d:b9:c9:e6:
3e:70:c7:b5:7a:0a:be:e1:c1:68:f9:7e:38:77:13:
0a:cb
Exponent: 65537 (0x10001)
Signature Algorithm: sha256WithRSAEncryption
Signature Value:
67:a7:c0:00:b3:28:aa:6a:8c:cf:4e:7f:16:34:ac:ee:26:52:
1a:e3:89:c0:a2:67:55:fe:e7:e8:84:6f:7d:3a:9d:2e:67:a8:
2f:03:cf:86:a5:a3:d4:f2:bb:06:1c:fc:b7:11:1f:9b:cd:8d:
2e:37:47:28:a7:13:4e:66:20:48:ee:d7:f0:d7:e9:4a:e7:6a:
46:d0:5d:8d:7e:93:e6:6e:8c:69:57:2e:ab:15:c1:83:67:30:
6c:af:17:10:28:e6:6f:80:67:ff:4f:eb:af:e1:f7:07:3c:7b:
e6:84:6b:48:18:e1:55:94:7a:91:f2:80:cc:8a:4e:ce:fc:36:
74:8c:3f:df:ce:d4:64:50:ab:2c:e4:29:53:4d:be:0b:02:1c:
7d:4b:17:45:76:91:3a:0b:5b:f6:af:b8:be:20:c3:68:86:ee:
fb:45:f7:1f:df:87:df:4a:6e:65:e8:69:d2:dc:76:7e:7b:f0:
45:e4:65:cb:f1:a5:a6:33:d2:d0:8f:20:b5:38:09:0b:5c:ff:
ab:10:be:33:0d:7e:2b:ed:40:53:fa:78:fe:e8:58:4e:98:b2:
d4:39:e5:17:db:e2:e4:48:d1:a7:bc:4e:29:38:8d:ba:6e:e5:
aa:f7:ee:1c:95:3c:73:91:98:37:d3:43:34:24:72:8a:0f:76:
ca:04:60:73
24-07-16 16:13:33.690 24-07-16 16:13:33.690
TTCPBlockSocket.SSL.LibName:ssl_openssl3
24-07-16 16:13:33.690 24-07-16 16:13:33.690
TTCPBlockSocket.SSL.Ciphers:DEFAULT
24-07-16 16:13:33.690 24-07-16 16:13:33.690
TTCPBlockSocket.SSL.GetCipherName:TLS_AES_256_GCM_SHA384
24-07-16 16:13:33.690 24-07-16 16:13:33.690
TTCPBlockSocket.SSL.Certificate:''
Can sometime tell me why?
Thanks in advance.
Dennis Poon
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