Hello Fly-ers,
There’s a chance that this is not a Fly specific issue, but I haven’t been able to figure it out.
We have an app, flexpa-flexpa-com.fly.dev, with two SSL certificates for flexpa.com and www.flexpa.com.
Rather consistently, we are getting reports from users about SSL warnings. Initially, I thought these were due to old devices or browsers, but I now have a fairly reliable user report. What’s particularly strange about it is that the SSL warning is appearing on multiple different devices/browsers on their network but not when they switch to another network with the same devices.
An example cURL from this user report:
curl -vvv https://flexpa.com/
* Trying 213.188.221.134...
* TCP_NODELAY set
* Connected to flexpa.com (213.188.221.134) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
* CAfile: /etc/ssl/cert.pem
CApath: none
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
* TLSv1.2 (IN), TLS handshake, Server finished (14):
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
* TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (OUT), TLS handshake, Finished (20):
* LibreSSL SSL_connect: SSL_ERROR_SYSCALL in connection to flexpa.com:443
* Closing connection 0
curl: (35) LibreSSL SSL_connect: SSL_ERROR_SYSCALL in connection to flexpa.com:443
Multiple device screenshots:
What am I missing here? I’ve verified the validity of the cert in a bunch of different ways. Is there some kind of DNS level filtering that could be going on here?
checkssl.org results for flexpa.com:
flexpa.com
-> Fly/523fc696 (2022-04-06) - Next.js
-> HTTP/2 with TLS v1.3 (released 2018) - latest version
-> TLS_AES_128_GCM_SHA256 = TLS, message encrypted with AES128 GCM, hashes are SHA256
1) flexpa.com expires on 2022-05-16 9:30PM Mon (32.3 days)
CA-2) R3 expires on 2025-09-15 4:00PM Mon (1250.1 days)
CA-3) ISRG Root X1 expires on 2035-06-04 11:04AM Mon (4798.9 days)
[PASS] https://flexpa.com
Checking the cert with openssl (openssl s_client -showcerts -servername flexpa.com -connect flexpa.com:443 < /dev/null):
λ › openssl s_client -showcerts -servername flexpa.com -connect flexpa.com:443 < /dev/null ~
CONNECTED(00000005)
depth=2 C = US, O = Internet Security Research Group, CN = ISRG Root X1
verify return:1
depth=1 C = US, O = Let's Encrypt, CN = R3
verify return:1
depth=0 CN = flexpa.com
verify return:1
---
Certificate chain
0 s:CN = flexpa.com
i:C = US, O = Let's Encrypt, CN = R3
a:PKEY: id-ecPublicKey, 256 (bit); sigalg: RSA-SHA256
v:NotBefore: Feb 15 21:30:58 2022 GMT; NotAfter: May 16 21:30:57 2022 GMT
-----BEGIN CERTIFICATE-----
MIIETjCCAzagAwIBAgISA4mG4+ZIeJk4zdzzBppKujYTMA0GCSqGSIb3DQEBCwUA
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x5s=
-----END CERTIFICATE-----
1 s:C = US, O = Let's Encrypt, CN = R3
i:C = US, O = Internet Security Research Group, CN = ISRG Root X1
a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256
v:NotBefore: Sep 4 00:00:00 2020 GMT; NotAfter: Sep 15 16:00:00 2025 GMT
-----BEGIN CERTIFICATE-----
MIIFFjCCAv6gAwIBAgIRAJErCErPDBinU/bWLiWnX1owDQYJKoZIhvcNAQELBQAw
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nLRbwHOoq7hHwg==
-----END CERTIFICATE-----
2 s:C = US, O = Internet Security Research Group, CN = ISRG Root X1
i:O = Digital Signature Trust Co., CN = DST Root CA X3
a:PKEY: rsaEncryption, 4096 (bit); sigalg: RSA-SHA256
v:NotBefore: Jan 20 19:14:03 2021 GMT; NotAfter: Sep 30 18:14:03 2024 GMT
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----
---
Server certificate
subject=CN = flexpa.com
issuer=C = US, O = Let's Encrypt, CN = R3
---
No client certificate CA names sent
Peer signing digest: SHA256
Peer signature type: ECDSA
Server Temp Key: X25519, 253 bits
---
SSL handshake has read 4176 bytes and written 396 bytes
Verification: OK
---
New, TLSv1.3, Cipher is TLS_AES_256_GCM_SHA384
Server public key is 256 bit
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
---
DONE