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Nmap reporting open http-proxy on 8080, but none is running

One of the many tools that admins frequently turned to was netstat. However, the netstat command has been deprecated in favor of the faster, more human-readable ss command. The ss command is a tool ...
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Git Bash Default Port 22 to 443

Try to change to 443 in ~/.ssh/config. In ubuntu, change the port on: sudo nano ~/.ssh/config See my other answer on using that for GitHub in here
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Debian 11, multiple Solr versions running on different ports, lsof says that Solr9 is accessible only from localhost.localdomain

I think I have found the solution, it has nothing to do with running multiple versions of solr, I was having the identical issue on a fresh Debian install. so the solution is: open the configuration ...
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How do I specify a port other than 80 when adding SSL certificate using Certbot?

The suggestion of @tero-kilkanen bring me to the idea to use the default-catch all VHost on port 80 for verifications, and give its webroot to the certbot command for any domain: certbot certonly --...
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iptables Limit port : ip 1:1 ( each port 1 ip only ) in order to limit each user

If you know the source IP of the users, have you considered TCPwrappers instead? https://www.cyberciti.biz/faq/tcp-wrappers-hosts-allow-deny-tutorial/ Sees an easier to manage approach.
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