Member Avatar for Fourier12

If I scan someones IP address with a port scanner and find an open port (Lets say they opened the port so it's not restricted by any protocol rules), are you then able to access their computer's command prompt? Can you upload or download files to / from their computer? If so, how do you do these things?

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  • Latest Post Latest Post by crunchie

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Short answer to : an open port only means a program is listening on that TCP/UDP port. It does not automatically give a command prompt, file access, or a remote shell. Remote interactive access requires either (a) a service that provides shell/file functionality and accepts the connection (with or without credentials), or (b) a specific vulnerability in the listening service that allows remote code execution. An open port is an entry point, not an automatic takeover.

and are right to flag the legality and ethics: scanning or exploiting third‑party systems without explicit written permission can be illegal. Authorized testing should follow an agreed scope and rules of engagement. See the formal testing guidance in NIST SP 800-115 for lawful, professional procedures.

For owners and defenders: inventory exposed ports and services, close or firewall any that are unnecessary, restrict access to trusted IPs, enforce strong authentication (use key-based SSH, disable default accounts), keep services patched, enable logging/alerts, and use IDS/IPS and segmentation to limit lateral movement. For safe discovery on systems one owns, use established tools and docs (for example, Nmap port scanning techniques) and check service mappings at the IANA port registry.

Quick troubleshooting checklist for administrators: confirm which process is listening, verify whether the port is locally bound or NAT/forwarded, check service version and logs for suspicious activity, review firewall and router forwarding rules, and apply patches. For learning, use isolated labs or intentionally vulnerable VMs and always obtain permission before testing other networks.

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Member Avatar for PhilliePhan

If I scan someones IP address with a port scanner and find an open port (Lets say they opened the port so it's not restricted by any protocol rules), are you then able to access their computer's command prompt? Can you upload or download files to / from their computer? If so, how do you do these things?

LOL! You're kidding, right? You're going to ask that in this forum?

I doubt you'll get much help with that here....

Cheers :)
PP

Member Avatar for crunchie

No illegal activity discussion on these forums thank you.

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