Failed to get the EPSV port from: CWD command successful.

[FeodorFitsner]

FTP OS: Windows

FTP Server: Azure Web Sites

Computer OS: Ubuntu 18.04

.NET version: .NET Core 3.0 Preview 6

Getting Failed to get the EPSV port from: CWD command successful. on subsequent file upload to Azure Web Site FTP.

FTP client created as:

ftp = new FtpClient();

ftp.EnableThreadSafeDataConnections = false;
ftp.Host = serverAddress;
ftp.Credentials = new NetworkCredential(username, password);
ftp.DataConnectionType = FtpDataConnectionType.AutoPassive;
ftp.StaleDataCheck = false;

Logs :

[Verbose]: >         Connect()
[Info]: Status:   Connecting to 137.117.16.18:21
[Info]: Response: 220 Microsoft FTP Service
[Info]: Status:   Detected FTP server: WindowsServerIIS
[Info]: Command:  USER ftp-test\$ftp-test
[Info]: Response: 331 Password required
[Info]: Command:  PASS ***
[Info]: Response: 230 User logged in.
[Info]: Command:  FEAT
[Info]: Response: 211 END
[Verbose]: Response: 211-Extended features supported:
Response: LANG EN*
Response: UTF8
Response: AUTH TLS;TLS-C;SSL;TLS-P;
Response: PBSZ
Response: PROT C;P;
Response: CCC
Response: HOST
Response: SIZE
Response: MDTM
Response: REST STREAM
[Info]: Status:   Text encoding: System.Text.UTF8Encoding+UTF8EncodingSealed
[Info]: Command:  OPTS UTF8 ON
[Info]: Response: 200 OPTS UTF8 command successful - UTF8 encoding now ON.
[Info]: Command:  SYST
[Info]: Response: 215 Windows_NT
[Info]: Status:   Auto-detected Windows listing parser

# Uploading artifact "FileZillaClient.exe" to FTP server "ftp://waws-prod-bay-003.ftp.azurewebsites.windows.net" as "site/wwwroot/downloads/appveyor-test/1.0.43/linux/FileZillaClient.exe"

[Verbose]: >         DirectoryExistsAsync("site/wwwroot/downloads/appveyor-test/1.0.43/linux")
[Verbose]: >         GetWorkingDirectoryAsync()
[Info]: Command:  PWD
[Info]: Response: 257 "/" is current directory.
[Info]: Command:  CWD site/wwwroot/downloads/appveyor-test/1.0.43/linux
[Info]: Response: 550 The system cannot find the path specified. 

# Creating remote directory "site/wwwroot/downloads/appveyor-test/1.0.43/linux"...

[Verbose]: >         CreateDirectoryAsync("site/wwwroot/downloads/appveyor-test/1.0.43/linux", True)
[Verbose]: >         DirectoryExistsAsync("site/wwwroot/downloads/appveyor-test/1.0.43")
[Verbose]: >         GetWorkingDirectoryAsync()
[Info]: Command:  PWD
[Info]: Response: 257 "/" is current directory.
[Info]: Command:  CWD site/wwwroot/downloads/appveyor-test/1.0.43
[Info]: Response: 550 The system cannot find the file specified. 
[Verbose]: Status:   Create non-existent parent directory: site/wwwroot/downloads/appveyor-test/1.0.43
[Verbose]: >         CreateDirectoryAsync("site/wwwroot/downloads/appveyor-test/1.0.43", True)
[Verbose]: >         DirectoryExistsAsync("site/wwwroot/downloads/appveyor-test")
[Verbose]: >         GetWorkingDirectoryAsync()
[Info]: Command:  PWD
[Info]: Response: 257 "/" is current directory.
[Info]: Command:  CWD site/wwwroot/downloads/appveyor-test
[Info]: Response: 250 CWD command successful.
[Info]: Command:  CWD /
[Info]: Response: 250 CWD command successful.
[Verbose]: >         DirectoryExistsAsync("site/wwwroot/downloads/appveyor-test/1.0.43")
[Verbose]: >         GetWorkingDirectoryAsync()
[Info]: Command:  PWD
[Info]: Response: 257 "/" is current directory.
[Info]: Command:  CWD site/wwwroot/downloads/appveyor-test/1.0.43
[Info]: Response: 550 The system cannot find the file specified. 
[Verbose]: Status:   CreateDirectory site/wwwroot/downloads/appveyor-test/1.0.43
[Info]: Command:  MKD site/wwwroot/downloads/appveyor-test/1.0.43
[Info]: Response: 257 "site/wwwroot/downloads/appveyor-test/1.0.43" directory created.
[Verbose]: Status:   CreateDirectory site/wwwroot/downloads/appveyor-test/1.0.43/linux
[Info]: Command:  MKD site/wwwroot/downloads/appveyor-test/1.0.43/linux
[Info]: Response: 257 "site/wwwroot/downloads/appveyor-test/1.0.43/linux" directory created.
OK

#Uploading "site/wwwroot/downloads/appveyor-test/1.0.43/linux/FileZillaClient.exe"...

[Verbose]: >         OpenWriteAsync("site/wwwroot/downloads/appveyor-test/1.0.43/linux/FileZillaClient.exe", Binary)
[Info]: Command:  TYPE I
[Info]: Response: 200 Type set to I.
[Verbose]: >         OpenPassiveDataStreamAsync(AutoPassive, "STOR site/wwwroot/downloads/appveyor-test/1.0.43/linux/FileZillaClient.exe", 0)
[Info]: Command:  EPSV
[Info]: Response: 229 Entering Extended Passive Mode (|||10100|)
[Info]: Status:   Connecting to 137.117.16.18:10100
[Info]: Command:  STOR site/wwwroot/downloads/appveyor-test/1.0.43/linux/FileZillaClient.exe
[Info]: Response: 125 Data connection already open; Transfer starting.
[Verbose]: Status:   Disposing FtpSocketStream...
[Verbose]: Status:   Disposing FtpSocketStream...
OK

# Uploading artifact "node-v10.16.0-win-x64.7z" to FTP server "ftp://waws-prod-bay-003.ftp.azurewebsites.windows.net" as "site/wwwroot/downloads/appveyor-test/1.0.43/linux/node-v10.16.0-win-x64.7z"

[Verbose]: >         DirectoryExistsAsync("site/wwwroot/downloads/appveyor-test/1.0.43/linux")
[Verbose]: >         GetWorkingDirectoryAsync()
[Info]: Command:  PWD
[Info]: Response: 226 Transfer complete.
[Warn]: Warning:  Failed to parse working directory from: Transfer complete.
[Info]: Command:  CWD site/wwwroot/downloads/appveyor-test/1.0.43/linux
[Info]: Response: 257 "/" is current directory.
[Info]: Command:  CWD .
[Info]: Response: 250 CWD command successful.

# Uploading "site/wwwroot/downloads/appveyor-test/1.0.43/linux/node-v10.16.0-win-x64.7z"...

[Verbose]: >         OpenWriteAsync("site/wwwroot/downloads/appveyor-test/1.0.43/linux/node-v10.16.0-win-x64.7z", Binary)
[Verbose]: >         OpenPassiveDataStreamAsync(AutoPassive, "STOR site/wwwroot/downloads/appveyor-test/1.0.43/linux/node-v10.16.0-win-x64.7z", 0)
[Info]: Command:  EPSV
[Info]: Response: 250 CWD command successful.
[Info]: Command:  QUIT
[Info]: Response: 229 Entering Extended Passive Mode (|||10102|)
[Verbose]: Status:   Disposing FtpSocketStream...
Failed to get the EPSV port from: CWD command successful.

Could you spot a problem from these logs? Please let me know if you have more information.

Thank you!

[robinrodricks]

How is this a bug with FluentFTP if Azure FTP service is performing incorrectly? As far as I can tell, the 229 Entering Extended Passive Mode is being sent after the QUIT command which does not make sense.