What Is Failed Ftp Upload: 550

In a example I worked on, FTP file upload was working fine while FTPS was failing with the mistake bulletin below. Information technology was failing for all IIS servers and all FTP clients.

550 supply message incomplete, signature was not verified

Sample FTP log:

          2019-06-xiii 20:28:26 134.165.112.56 SERVER\user 134.45.232.24 21 STOR test.txt 550 2148074264 0 05edb0d4-756e-4509-8d5e-4f566cae5bfb /test.txt

The sample FTP log higher up shows 2148074264 as sc-win32-status. This error code maps to SEC_E_INCOMPLETE_MESSAGE which means "The supplied bulletin is incomplete. The signature was not verified".

There is a known issue in Windows Server 2008, 2008 R2, 2012, and 2012 R2 that causes this error while using FTPS because of a bug in TLS communication.

Here is the hot-fix folio for this bug. The download link in this page is broken. Nonetheless, yous can endeavour downloading information technology via this page or this one. Install the hot-fix and restart the server.

If you receive "This update is non applicable" error while trying to install the hot-fix:

Extract the KB (MSU file) using this command:

          Expand –F:* <path of downloaded KB>  <Destination folder where you need to extract>

Run the command below to install the patch:

          DISM.exe /Online /Add-Package /PackagePath:<path of the extracted file (select.cab file)>

Brand certain to apply the correct update for your server'due south operating system. If you are withal seeing "550 supply message incomplete" error, endeavor the following steps.

Connect to FTP server via IP

If yous are using a hostname (ftp.domain.com etc.) for FTP connections, perform the following instructions:

In the client automobile, open Hosts file (C:\Windows\System32\drivers\etc\hosts)
Enter the line below and salve it (Enter IIS server's IP accost instead of 192.168.1.100)
192.168.one.100 ftp.domain.com
Run ipconfig /flushdns
Attempt to connect FTP server again. If information technology works, it means there is a firewall blocking the FTPS port between client and server. If it doesn't work, keep with the next department.

Try using SFTP instead of FTPS

FTPS uses ii channels: Command Channel and Data Aqueduct. Some firewalls and routers let Data Channel advice merely afterwards reading the Command Channel data. If they can't decrypt the Control Channel data when FTPS is used, they may cake Data Channel communication.

SFTP uses only one channel for both commands and data. Therefore, this consequence may not occur if you use SFTP. If it still occurs, go on with next section below.

A screenshot that shows protocols in an FTP client

Attempt disabling TLS 1.2 in IIS server

It is not recommended to disable TLS 1.2 but this examination would assistance you to narrow down the issue. Please do non disable TLS in your product servers.

In gild to disable TLS one.2 for testing purposes:

Go to Registry Editor
Go this path:HKEY_LOCAL_MACHINE\Arrangement\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.ii\Client
Add these two D-Words:
DisabledByDefault =i
Enabled = 0
Restart the server

Source: https://techcommunity.microsoft.com/t5/iis-support-blog/550-supply-message-incomplete-error-ftps-file-upload/ba-p/806901

Posted by: whiteliontion.blogspot.com