While the cause of hives is often difficult to identify, many natural hives treatments work no matter the cause. One particularly effective hives treatment is activated charcoal. Taken on an empty stomach, activated charcoal absorbs any toxins or allergens in the system and clears the outbreak in as little as one day.hile the cause of hives is often difficult to identify, many natural hives treatments work no matter the cause. One particularly effective hives treatment is activated charcoal. Taken on an empty stomach, activated charcoal absorbs any toxins or allergens in the system and clears the outbreak in as little as one day.
FTP (File Transfer Protocol) Port Number 21. Reserved TCP port used by File Transfer Protocol (FTP) to initiate and control connections to FTP servers. To establish an FTP session, clients initiate a connection to an FTP server that listens on TCP port 21 by default.
How the TCP Port 21 Works With FTP. The File Transfer Protocol Uses Port 20 and 21. The File Transfer Protocol (FTP) provides a means to transfer information online, much like how the Hypertext Transfer Protocol (HTTP) is used through a web browser. FTP, however, operates on two different TCP ports: 20 and 21.