Error #100805
530 Connection refused, unknown IP address.
421 Service not available, closing control connection.
Connection closed by remote host.
421 Service not available, closing control connection.
Connection closed by remote host.
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Microsoft KB article
Changes to the IP restriction list of an FTP site are not applied until you restart the FTP service in IIS 6.0:
http://support.microsoft....;spid=2097
Comments
If this is for IIS, open the IIS MMC, right-click on "FTP Sites", select "Properties", go to the "Messages" tab, increase the "Maximum connections" value by 1, and click "Apply". See if that works. IIS can erroneously attribute a Maximum Connection "violation" by displaying these two error messages together.