FTP Certificate TLS Encryption fix

• Windows 2008 R2 - IIS 7.5 using FTP
• FileZilla (Protocol=FTP; Encryption=Require explicit FTP over TLS; Logon Type:=Normal; UserName=****; Passwword=****** Currently there are 3 virtual drives and when I connect via FileZilla they all display fine, however when I try to configure a 4th virtual directory it will not display in FileZilla.

I am actually getting a sporadic failure all together after the directory is created:

Command: LIST Error: GnuTLS error -110: The TLS connection was non-properly terminated. Status: Server did not properly shut down TLS connection Error: Transfer connection interrupted: ECONNABORTED - Connection aborted Response: 550 Keyset does not exist Error: Failed to retrieve directory listing

If I delete the Virtual Directory the directories will display again. What is wrong, all the permissions are identical. Is there something with the SSL that has to be configured on the directory? Any assistance would be great.

http://serverfault.com/questions/655968/iis-7-5-ftp-and-virtual-directory/690420#690420

ANSWER - The "550 Keyset does not exist" error message may be caused by the pass-through authentication settings for the virtual directory. If pass-trough authentication is configured to use a 'specific user' rather than the default setting of 'application user' then the 550 error will be returned unless(probably) the 'specific user' is granted permission to access the Machine Keys for certificates.

Granted READ ONLY Access to the C:\ProgramData\Microsoft\Crypto\RSA directory for the particular FTP User Account