amazon web services – Cannot sign in to aws console

I’m having problems getting to the signin page of aws in Ubuntu 20.04 with latest updates. As I suspect this to be a network problem, I’ve tried accessing with curl and openssl. Sometimes (randomly) following commands doesn’t fail and I get successful responses, but most of the time I’m getting following responses:

~ curl -vvv
*   Trying
* Connected to ( port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/certs/ca-certificates.crt
  CApath: /etc/ssl/certs
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to 
* Closing connection 0
curl: (35) OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to
openssl s_client -connect 
no peer certificate available
No client certificate CA names sent
SSL handshake has read 0 bytes and written 313 bytes
Verification: OK
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)

Some observations:

  • resolves to different ip addresses and I’ve checked I’m getting both successful and error responses from same ip addresses.
  • When I get a successful response, usually next few calls are also successful if I keep trying.
  • If I connect to a VPN, these calls never fail
  • I have two ubuntu machines at home both of the have the same problem. I’ve installed curl to a windows machine and it never had the problem.
  • Successful sessions are using TLSv1.2 as expected
  • I have a very stable 100 Mbit connection with very low ping times and this problem doesn’t happen with any other domain
  • Both commands fail after 23 seconds. However when they’re successful, it takes ~400ms.
  • I tried to replace my router, but got the same results.
  • My ISP changed my IP address, but that didn’t help. As the calls are sometimes working I don’t think it’s a black-listing problem.
  • I cannot connect to site with browsers or other cli tools neither.

What else can I try to find the cause of this issue?