Web - internal server error

Hello, I have been using hestia cp for a year, everything has worked very well, today one of my servers with hestia had problems, it had never happened to me, I use hestia for client websites, and today it simply does not load the web page and it tells me a server error, It was solved by restarting the server, but I’m worried about the causes, I checked the disk and the ram and everything was in order, how can I verify the error and avoid it happening again, thanks

Check /var/log/apache2/domains/domain.error.log or /var/log/nginx/domains/domain.error.log

Hello, thanks for answering, and I checked the history of one and this is what it indicates.
at this point what could it be? something from the server or network traffic?, I would appreciate a lot of response

2023/01/25 07:54:40 [error] 129619#129619: *153914 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 186.84.88.193, server: domain.ed                                                  u.co, request: "GET /wp-login.php?redirect_to=https%3A%2F%2Fdomain.edu.co%2Fwp-admin%2F&reauth=1 HTTP/2.0", upstream: "https://209.126.12.142:8443/wp-login.php?redirect_to=h                                                  ttps%3A%2F%2Fdomain.edu.co%2Fwp-admin%2F&reauth=1", host: "domain.edu.co"
2023/01/25 07:55:10 [error] 129619#129619: *153914 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 186.84.88.193, server: domain.ed                                                  u.co, request: "GET /favicon.ico HTTP/2.0", upstream: "https://209.126.12.142:8443/favicon.ico", host: "domain.edu.co", referrer: "https://domain.edu.co/wp-log                                                  in.php?redirect_to=https%3A%2F%2Fdomain.edu.co%2Fwp-admin%2F&reauth=1"
2023/01/25 08:14:13 [error] 129619#129619: *157325 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 181.51.32.1, server: domain.edu.                                                  co, request: "GET /2019/02/28/simbolos/ HTTP/2.0", upstream: "https://209.126.12.142:8443/2019/02/28/simbolos/", host: "domain.edu.co", referrer: "https://www.google.com/"
2023/01/25 08:20:24 [error] 129619#129619: *158202 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 66.249.73.115, server: domain.ed                                                  u.co, request: "GET /favicon.ico HTTP/1.1", upstream: "https://209.126.12.142:8443/favicon.ico", host: "domain.edu.co"
2023/01/25 08:26:34 [error] 129619#129619: *159076 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 186.84.90.123, server: domain.ed                                                  u.co, request: "GET / HTTP/2.0", upstream: "https://209.126.12.142:8443/", host: "domain.edu.co", referrer: "https://dashboard.tawk.to/"
2023/01/25 08:26:37 [error] 129619#129619: *159088 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 66.249.73.117, server: domain.ed                                                  u.co, request: "GET /favicon.ico HTTP/1.1", upstream: "https://209.126.12.142:8443/favicon.ico", host: "domain.edu.co"
2023/01/25 08:27:04 [error] 129619#129619: *159076 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 186.84.90.123, server: domain.ed                                                  u.co, request: "GET /favicon.ico HTTP/2.0", upstream: "https://209.126.12.142:8443/favicon.ico", host: "domain.edu.co", referrer: "https://domain.edu.co/"
2023/01/25 08:36:51 [error] 129620#129620: *162122 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 35.185.76.79, server: domain.edu                                                  .co, request: "GET / HTTP/1.1", upstream: "https://209.126.12.142:8443/", host: "domain.edu.co"
2023/01/25 08:37:21 [error] 129619#129619: *162370 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 35.185.76.79, server: domain.edu                                                  .co, request: "GET / HTTP/1.1", upstream: "https://209.126.12.142:8443/", host: "domain.edu.co"
2023/01/25 08:38:45 [error] 129619#129619: *162901 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 35.185.76.79, server: domain.edu                                                  .co, request: "GET / HTTP/1.1", upstream: "https://209.126.12.142:8443/", host: "domain.edu.co"
2023/01/25 08:39:15 [error] 129619#129619: *163098 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 35.185.76.79, server: domain.edu                                                  .co, request: "GET / HTTP/1.1", upstream: "https://209.126.12.142:8443/", host: "domain.edu.co"
2023/01/25 08:40:33 [error] 129619#129619: *163599 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 35.185.76.79, server: domain.edu                                                  .co, request: "GET / HTTP/1.1", upstream: "https://209.126.12.142:8443/", host: "domain.edu.co"
2023/01/25 08:41:03 [error] 129619#129619: *163776 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 35.185.76.79, server: domain.edu                                                  .co, request: "GET / HTTP/1.1", upstream: "https://209.126.12.142:8443/", host: "domain.edu.co"
2023/01/25 08:41:53 [error] 129619#129619: *164087 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 35.185.76.79, server: domain.edu                                                  .co, request: "GET /wp-login.php HTTP/1.1", upstream: "https://209.126.12.142:8443/wp-login.php", host: "domain.edu.co"
2023/01/25 08:42:24 [error] 129619#129619: *164228 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 35.185.76.79, server: domain.edu                                                  .co, request: "GET /admin/ HTTP/1.1", upstream: "https://209.126.12.142:8443/admin/", host: "domain.edu.co"
2023/01/25 08:49:30 [error] 129619#129619: *166005 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 40.77.167.43, server: domain.edu                                                  .co, request: "GET /wp-sitemap.xml HTTP/2.0", upstream: "https://209.126.12.142:8443/wp-sitemap.xml", host: "domain.edu.co"
2023/01/25 08:52:09 [error] 129619#129619: *166422 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 114.119.138.199, server: domain.                                                  edu.co, request: "GET /2021/03/14/protocolo-de-bioseguridad/ HTTP/1.1", upstream: "https://209.126.12.142:8443/2021/03/14/protocolo-de-bioseguridad/", host: "domain.edu.co",                                                   referrer: "https://domain.edu.co/category/noticias/"
2023/01/25 09:04:25 [error] 129619#129619: *167933 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 204.199.68.9, server: domain.edu                                                  .co, request: "GET /robots.txt HTTP/2.0", upstream: "https://209.126.12.142:8443/robots.txt", host: "domain.edu.co"
2023/01/25 09:04:25 [error] 129619#129619: *167934 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 204.199.68.9, server: domain.edu                                                  .co, request: "GET / HTTP/2.0", upstream: "https://209.126.12.142:8443/", host: "domain.edu.co"
2023/01/25 09:09:42 [error] 129619#129619: *168616 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 204.199.68.9, server: domain.edu                                                  .co, request: "GET / HTTP/2.0", upstream: "https://209.126.12.142:8443/", host: "domain.edu.co"
2023/01/25 09:16:01 [error] 129619#129619: *169187 upstream timed out (110: Connection timed out) while SSL handshaking to upstream, client: 204.199.68.9, server: domain.edu                                                  .co, request: "GET /wp-content/home/domain/web/domain.edu.co/v6/skin.css HTTP/2.0", upstream: "https://209.126.12.142:8443/wp-content/home/domain                                                  /web/domain.edu.co/v6/skin.css", host: "domain.edu.co", referrer: "https://domain.edu.co/"

Observations.
* I can access the hestia panel without problems,

  • failures are only reflected on websites.