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I'm doing a PenTest on a server. I have an RCE vulnerability on it, but when I try to do a reverse connection via netcat, the firewall blocks it. Is there any other methods used for reverse connections, like DNS or something?

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There are lots and lots of methods to connect one machine to another (that's what you are trying to do). What you need to know is what the firewall will allow. Map out the firewall and then you will know what to do. The technique is called "firewalking".

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