I also get the "550 The supplied message is incomplete. The signature was not verified." error with version 3.7.0.2, using explicit FTP over TLS.
Code: Select all
Status: Starting upload of C:\temp\test.exe
Status: Retrieving directory listing...
Command: PASV
Response: 227 Entering Passive Mode (1,2,3,4,19,233).
Command: LIST
Response: 150 Opening BINARY mode data connection.
Response: 226 Transfer complete.
Command: PASV
Response: 227 Entering Passive Mode (1,2,3,4,19,234).
Command: STOR test.exe
Response: 150 Opening BINARY mode data connection.
Response: 550 The supplied message is incomplete. The signature was not verified.
Error: File transfer failed after transferring 1'225'748 bytes in 4 seconds
The connection does established, but if you want to upload any file, the above error appears.
Server 2012 / IIS 8 / With passive mode
@botg, if you need a test account for troubleshooting / reproducing, please contact me