How to fix the “tcpwrapped” error with NMAP scan?

"tcpwrapped" refers to tcpwrapper, a host-based network access control program on Unix and Linux. When Nmap labels something tcpwrapped, it means that the behavior of the port is consistent with one that is protected by tcpwrapper. Specifically, it means that a full TCP handshake was completed, but the remote host closed the connection without receiving any data. It is essential to note that tcpwrapper 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 this large number of ports are shown as tcpwrapped, it is unlikely that they represent real services, so the behavior probably means something else. You must probably be seeing is a network security device like a firewall or IPS. Many of these are configured to respond to TCP portscans, even for IP addresses that are not assigned to them. This behavior can slow down a port scan and cloud the results with false positives.