I have a server was running fine with port 443, but not it's not running.
using command sof -i -P -n | grep LISTEN, i get:
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)
and ufw status return inactive
checking from client side with command 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
what i have done before i get this error is editing the a line from /etc/dovecot/dovecot.conf
disable_plaintext_auth = yes
I have changed it to no and restancted devocot.service I saw this issue, then returned to yes restarted the service and reboot the server, still facing it.
