nginx 正在运行并且端口允许，但客户端已关闭

Question

我的服务器在端口 443 上运行良好，但现在它没有运行。

使用命令sof -i -P -n | grep LISTEN，我得到：

nginx     3124            root    6u  IPv4  39437      0t0  TCP *:443 (LISTEN)
nginx     3124            root    7u  IPv4  39438      0t0  TCP *:80 (LISTEN)
nginx     3125        www-data    6u  IPv4  39437      0t0  TCP *:443 (LISTEN)
nginx     3125        www-data    7u  IPv4  39438      0t0  TCP *:80 (LISTEN)

并ufw status返回inactive

使用命令从客户端检查nmap -P0 mydomain.com

Starting Nmap 7.80 ( https://nmap.org ) at 2023-12-11 09:17 EET
Nmap scan report for mydomain.com (IP Address)
Host is up (0.069s latency).
rDNS record for IP ADDRESS: ***********
Not shown: 991 filtered ports
PORT    STATE  SERVICE
22/tcp  open   ssh
80/tcp  open   http
110/tcp closed pop3
143/tcp closed imap
443/tcp closed https
465/tcp closed smtps
587/tcp closed submission
993/tcp closed imaps
995/tcp closed pop3s

Nmap done: 1 IP address (1 host up) scanned in 5.77 seconds

在出现此错误之前，我所做的就是编辑一行/etc/dovecot/dovecot.conf

disable_plaintext_auth = yes

我已将其更改为no并恢复，devocot.service我看到了这个问题，然后返回yes重新启动服务并重新启动服务器，但仍然面临它。