I have a very strange problem and I would like to find a starting point to solve it.
The problem appears on my laptops with Ubuntu (16.04 and 19.04) when I turn on VPN (network-manager-vpnc) but only on my parent's WiFi. And that is a super strange thing to me. When I switch to tethering on my phone then everything (except very weak GSM signal:]) is fine. Moreover it seems that problem is only with HTTPS connections. curl hangs on TLS:
$ curl https://www.onet.pl/ -v * Expire in 0 ms for 6 (transfer 0x55cd601785c0) ... <Expire in... repeated many times>... * Expire in 0 ms for 1 (transfer 0x55cd601785c0) * Trying 22.214.171.124... * TCP_NODELAY set * Expire in 200 ms for 4 (transfer 0x55cd601785c0) * Connected to www.onet.pl (126.96.36.199) port 443 (#0) * ALPN, offering h2 * ALPN, offering http/1.1 * successfully set certificate verify locations: * CAfile: none CApath: /etc/ssl/certs * TLSv1.3 (OUT), TLS handshake, Client hello (1):
But when HTTP used:
$ curl onet.pl <html> <head><title>301 Moved Permanently</title></head> <body bgcolor="white"> <center><h1>301 Moved Permanently</h1></center> <hr><center>nginx</center> </body> </html>
it returns a response.
Any idea what may be wrong? Please let me know if you need more info to help.