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IP Restrictions On FTP Folders In IIS Not Working

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Hello.

I've exhaustively searched for an answer to this IP Restrictions issue without success.  Any guidance provided is greatly appreciated.

The environment is FTP running in IIS on Windows Server 2016 in Azure.   Multiple users are setup in FTP using FTP User Isolation of 'User name physical directory'.   

I need to restrict FTP access by IP for some users, but not all.   It appears I can add an IP restriction by User folder, as the changes are reflected in the ApplictionaHost.config file for the specific folder.   In my sample I am denying one IP address as a test on the 'UserA" folder.   (No 'Allow' feature is set within this testing.)

I hope these images come through.

Folders

Config


I have restarted the IIS and FTP services between tests.   I cannot get the restriction to work at the folder level.  In testing, the only place the IP restriction seems will work is if it is at the top FTP site level.  Setting it there it give a 'home folder inaccessible' error.  
The FTP log file shows correct client IPs so it's not a NAT or Proxy issue.

Any thoughts on how to get the IP Restrictions to work on selected FTP User folders?  Many thanks in advance.


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