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FTP "550 Access is denied" Error

I have two Clients that connect to FTP (configured as part of IIS), both Clients can connect to FTP successfully, however Client A receives the message “550 Access is denied, Error: Critical file transfer error” when they try and upload the file while client B can successfully upload the file. They both use Filezilla in Windows environments.

Client exit

Status: Resolving address of 000.000.000.00 Status: Connecting to 000.000.000.00:21... Status: Connection established, waiting for welcome message... Response: 220 Microsoft FTP Service Command: USER wg\transfer Response: 331 Password required for wg\transfer. Command: PASS ********* Response: 230 User wg\transfer logged in. Status: Connected Status: Starting upload of C:\upload.zip Command: CWD / Response: 250 CWD command successful. Command: TYPE I Response: 200 Type set to I. Command: PASV Response: 227 Entering Passive Mode (000,000,000,00,22,96). Command: STOR upload.zip Response: 550 Access is denied. Error: Critical file transfer error

Client Exit B

 Status: Resolving address of 000.000.000.00 Status: Connecting to 000.000.000.00:21... Status: Connection established, waiting for welcome message... Response: 220 Microsoft FTP Service Command: USER wg\transfer Response: 331 Password required for wg\transfer. Command: PASS ********* Response: 230 User wg\transfer logged in. Status: Connected Status: Starting upload of C:\upload.zip Command: CWD / Response: 250 CWD command successful. Command: PWD Response: 257 "/" is current directory. Command: TYPE I Response: 200 Type set to I. Command: PASV Response: 227 Entering Passive Mode (000,000,000,00,22,99). Command: STOR upload.zip Response: 125 Data connection already open; Transfer starting. Response: 226 Transfer complete Status: File transfer successful, transferred 22,197 bytes in 7 seconds Status: Retrieving directory listing... Command: PASV Response: 227 Entering Passive Mode (000,000,000,00,22,100). Command: LIST Response: 125 Data connection already open; Transfer starting. Response: 226 Transfer complete

Can anyone shed some light on this? I think client A has some kind of firewall setting that prevents them from downloading files, but that seems rather strange.

Thanks in advance!

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3 answers

This is probably a firewall from client A that prevents this. FTP also requires the data channel to send its information.

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The permissions on client A are set so that they prevent your user from accessing the file entry there.

Contact them to ensure that file permissions on Windows are set so that the FTP user can write.

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If they use an FTP client to connect, make sure they connect via SFTP.

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Source: https://habr.com/ru/post/914439/

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