Hi Adarsh p s
Thanks for posting here.
To add Web sites using a unique port identifier using the Web Site Creation Wizard.
1.In IIS Manager, expand the local computer, right-click the FTP Sites folder, point to New, and click FTP Site.
2.Click Next.
3.In the Description box, type a description of your FTP site, and then click Next.
4.Under Enter the IP address to use for this FTP site, type your Web server's IP address.
5.Under Type the TCP port for this FTP site, change the TCP port from the default setting of 21 to an unallocated port number. If you are uncertain which port numbers are already allocated, choose
a high number, for example a number between 5000 and 5999.
6.Complete the rest of the FTP Site Creation Wizard.
Here are some documents you can refer to.
https://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/b77cf015-017f-489c-9b5b-65ca4a679392.mspx?mfr=true
https://support.microsoft.com/en-us/kb/2548832
Best Regards,
Sera Yu
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