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Ubuntu 16.04 telnet server10/20/2023 If you are connected to the internet you should be behind a firewall.Įither an external firewall, or one built into your machine. There are a LOT of them defined in there but of course unless the server is actually started then any connection attempts are ignored. The file that allows listening on various ports is If it is in fact telnet and you are not behind a firewall then indeed it is not safe. If you can connect to it, then you have something listening on that port. ![]() I don't know what you're asking me but my port 23 is open and I was able to connect to it from another pc with telnet.
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