FTP "550 Access is denied" Error

2018-06-21 09:17:00

I have two Clients who are connecting to an FTP (configured as part of IIS), both Clients can connect to the FTP successfully however Client A receives a "550 Access is denied , Error: Critical file transfer error" when they try and upload a file while Client B can successfully upload the file. They are both using Filezilla on Windows environments.

Client A Output

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 wgtransfer
Response:                    331 Password required for wgtransfer.
Command:                     PASS *********
Response:                    230 User wgtransfer 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 B Output

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 wgtransfer
Response:                    331 Password required for wgtransfer.
Command:                     PASS *********
Response:                    230 User wgtransfer 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 any light on this? I'm thinking Client A has some sort of Firewall setting preventing them from uploading files but this seems quite strange.

Thanks in advance!

Its probably the Firewall from Client A which is preventing this. FTP also requires a data channel to send its information

The permissions at client A are set such that they deny your user access to write a file there.

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

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