Subj : Re: Mystic SSHD won't start? Is there an SSH server?
To   : Phil Taylor
From : Jeff Smith
Date : Mon Sep 16 2019 12:13 pm

Hello Phil,

>> Yep I run 3 SSH daemons here:
 
>> OpenSSH on port 22 all IPs
>> Mystic on port 222 on selected IPs
>> Synchronet on port 222 on a different set of selected IPs.

> For security reason you may want to change your ssh port to above 20,000.

A simple port scan of Mystic.dynu.net reveals:

Port    Type    Status          Service
21      TCP     Filtered        ftp
22      TCP     Filtered        ssh
23      TCP     Filtered        telnet
25      TCP     Closed          smtp
53      TCP     Filtered        domain
80      TCP     Open            http
110     TCP     Filtered        pop3
111     TCP     Filtered        rpcbind
135     TCP     Filtered        msrpc
139     TCP     Filtered        netbios-ssn
143     TCP     Filtered        imap
222     TCP     Filtered        rsh-spx
389     TCP     Filtered        ldap
443     TCP     Filtered        https
445     TCP     Filtered        microsoft-ds
587     TCP     Filtered        submission
1025    TCP     Filtered        NFS-or-IIS
1080    TCP     Closed          socks
1433    TCP     Filtered        ms-sql-s
3306    TCP     Filtered        mysql
3389    TCP     Filtered        ms-wbt-server
5900    TCP     Filtered        vnc
6001    TCP     Filtered        X11:1
6379    TCP     Filtered        redis
8080    TCP     Filtered        http-proxy 

IOW, port status and availability can be determined quite easily
via FQDN or IP.

Jeff

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