Well, Sentora documentation is asking me to open this following ports:
20 & 21 : FTP 25 (TCP) : SMTP 53 (TCP & UDP) : DNS 80 (TCP & UDP) : HTTP 110 : POP3 143 : IMAP
Optional: If you have already setup (or will setup soon) SSL, you have to open also:
443 : HTTPS 3306: MySQL"
Yes, I want to use SSL. But I have no idea how to open a port in DO. Is that made on DNS or in the target Droplet?
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