Unable to connect to my server on some devices and network. While there is no problem on one device or the network, the website does not open at all on another.
When I try to curl I get this message from 1 of 10 curls, other 9 is
curl -I https://mydomain.com/ curl: (35) error:02FFF03C:system library:func(4095):Operation timed out
curl -v https://mydomain.com/ * Trying 184.108.40.206:443... * Connected to mydomain.com (220.127.116.11) port 443 (#0) * ALPN: offers h2 * ALPN: offers http/1.1 * CAfile: /etc/ssl/cert.pem * CApath: none * (304) (OUT), TLS handshake, Client hello (1): * error:02FFF03C:system library:func(4095):Operation timed out * Closing connection 0 curl: (35) error:02FFF03C:system library:func(4095):Operation timed out
Other success curls:
umid@Umid-MBP ~ % curl -I https://mydomain.com/ HTTP/1.1 200 OK Date: Wed, 01 Mar 2023 13:57:55 GMT Server: Apache/2.4.41 (Ubuntu) Set-Cookie: PHPSESSID=tp1ka9nalqqfa639idjtoa8ogv; path=/ Expires: Thu, 19 Nov 1981 08:52:00 GMT Cache-Control: no-store, no-cache, must-revalidate Pragma: no-cache Link: <https://mydomain.com/wp-json/>; rel="https://api.w.org/" Link: <https://mydomain.com/wp-json/wp/v2/pages/14921>; rel="alternate"; type="application/json" Link: <https://mydomain.com/>; rel=shortlink Content-Type: text/html; charset=UTF-8
Sometimes it happens and sometimes not.
fail2ban to check If they blocks but no change.
Ubuntu 20.04 / Apache2
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What I could suggest is running an mtr or traceroute from the devices that the connection is failing.
That way you will be able to tell where exactly the packets are getting lost.
Feel free to share the output of the traceroute here so we could advise you furhter1