Can I bypass tcpwrapped with the nmap scan?
How can I bypass tcpwrapped using the nmap scan? Do you know how to do that in a firewall policy?
"tcpwrapped" refers to tcp wrapper, a host-based network access control program on Unix and Linux. When Nmap labels something tcpwrapped, it means that the behaviour of the port is consistent with one that is protected by tcp wrapper. Specifically, it means that a full TCP handshake was completed, but the remote host closed the connection without receiving any data.
It is important to note that tcp wrapper protects programs, not ports. This means that a valid (not false-positive) tcpwrapped response indicates a real network service is available, but you are not on the list of hosts allowed to talk with it. When such a large number of ports are shown as tcpwrapped, it is unlikely that they represent real services, so the behaviour probably means something else.
What you are probably seeing is a network security device like a firewall or IPS. Many of these are configured to respond to TCP port scans, even for IP addresses which are not assigned to them. This behaviour can slow down a port scan and cloud the results with false positives.