FTP 550 Permission denied can only be used to create folders. The reason why files cannot be deleted or uploaded is described.

This problem occurs,
① First check the role name corresponding to the user, and then check whether the path is set correctly and whether there are related permissions. If there are no problems, then try the following operations:
② Restart the FTP service, preferably from the Service (cannot be solved at all );
③ Reset the file path in the Server-U account and Directory Access (if not, try the following operations );
④ Delete the user and recreate it.

Original SU sorting (FTP) favorites
As follows:

1-success
2-success
3-permission issues
4-file Problems
5-server problems
150 FILE: % s
150 Opening % s mode data connection for % s (% I64d Bytes ).
150 Opening % s mode data connection for % s.
150 Opening ASCII mode data connection for/bin/ls.
150 Opening BINARY mode data connection for MLSD.
200 (end of 'index % s ')
200 Command channel switched to clear-text.
200 Command OK, % I64d Bytes available on % s
200 Command okay.
200 EXEC command successful (TID = % u ).
200 Message received ed okay.
200 MLST OPTS
200 mode s OK.
200 mode z level set to % d.
200 mode z OK.
200 noted.
200 Opened OK (but not really ).
200 PBSZ command OK. Protection buffer size set to 0.
200 PBSZ = 0
200 PORT Command successful.
200 PROT command OK. Using clear data connection.
200 PROT command OK. Using private data connection.
200 SSCN: CLIENT METHOD
200 SSCN: SERVER METHOD
200 stru f OK.
200 stru r OK.
200 Transfer progress notification is off.
200 Transfer progress notification is on.
200 Type set to.
200 Type set to I.
202 Command not implemented, superfluous at this site.
202 Command not implemented, superfluous at this site.
210 UTC % + ld
211 End
211 End of status.
211-Extension supported
211-Status for user % Name from % IP:
213% I64d
213% s
214 Direct comments or bugs to bugs@bugs.com.
214-The following commands are recognized (* => unimplemented ).
215 UNIX Type: L8
220 Service ready for new user.
220 Serv-u ftp Server v % s for WinSock ready...
221 Goodbye!
226 ABOR command successful.
226 Transfer complete.
226 Transfer complete.
226 Transfer complete.
227 Entering Passive Mode (% d, % d)
230 Password changed okay.
230 Switching to system maintenance mode.
230 User logged in, proceed.
230 User logged in.
231 Switching to group maintenance mode.
232 Switching to domain maintenance mode.
233 Switching to READ-only maintenance mode.
233 User logged in, password expired-please change before proceeding.
234 AUTH command OK. Already have SSL connection.
234 AUTH command OK. Initializing SSL connection.
250% X
250 DELE command successful.
250 Directory changed to % s
250 End.
250 RMD command successful.
250 RNTO command successful.
250-Listing % s
253 Attributes changed okay.
253 Date/time changed okay.
257 "% s" directory created.
257 "% s" is current directory.
321 Transferred % I64d Bytes.
331 Response to otp-md % d % u % s required for skey.
331 User name okay, need password.
331 User name okay, please send complete E-mail address as password.
350 File or directory exists, ready for destination name
350 Restarting at % I64d. Send STORE or RETRIEVE.
421 Data connection closed (SSL/TLS negotiation failed ).
421 Service closing control connection.
425 Cannot open data connection.
425 Cannot open data connection.
425 Cannot open data connection.
425 Try later, data connection in use.
425 Try later, data connection in use.
425 Try later, data connection in use.
425 Try later, out of network sockets.
425 Try later, out of network sockets.
425 Try later, out of network sockets.
425 Unable to listen, too pending PASV requests from same client IP.
425 Unable to set up passive listening socket.
426 Data connection closed, cannot read file % s.
426 Data connection closed, cannot write file % s-disk full?
426 Data connection closed, error compressing data stream.
426 Data connection closed, error decompressing data stream.
426 Data connection closed, file transfer % s aborted by client.
426 Data connection closed, file transfer % s aborted.
426 Data connection closed, receive file % s aborted.
426 Data connection closed, transfer aborted.
426 Transfer aborted.
431 Account temporarily locked for other user, please try later.
431 Password not changed, no match for old password.
431 Unable to negotiate secure command connection.
432 Password not changed, new password shocould be at least % d characters in length.
432 Password not changed, new password shoshould contain at least one upper-case character and symbol
432 Password not changed, old and new passwords cannot be identical.
450 Cannot open file % s for reading.
452 Sorry, insufficient disk quota-receive file % s aborted.
500 '% s': command not understood.
501% s: Not a directory.
501 Cannot EXEC command line (error = % u ).
501 Invalid MLST options
501 Invalid option.
501 Not enough space, only % I64d Bytes available on drive % s
501 Permission denied.
501 SITE option not supported.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Syntax error in parameters or arguments.
501 Wildcards not allowed.
502 Syntax error-use site pswd "<oldpassword>" "<newpassword> ".
503 Bad sequence of commands.
503 Bad sequence of commands.
503 Secure command connection required prior to PBSZ command.
503 Secure command connection required prior to PROT command.
504 Command not implemented for that parameter.
504 Command not implemented for that parameter.
504 Command not implemented for that parameter.
504 Unknown security mechanisms.
510 Cannot determine server time zone.
521 Data connection cannot be opened with this PROT setting.
522 SSL/TLS lib refuses to initiate secure data connection.
530 Cannot change Anonymous password.
530 Cannot change password.
530 Not logged in, cannot find home directory.
530 Not logged in, home directory does not exist.
530 Not logged in, need secure connection.
530 Not logged in, only % d sessions from same IP allowed concurrently.
530 Not logged in, only one session from same IP allowed at a time.
530 Not logged in, too found tries with incorrect password.
530 Not logged in, unauthorized IP address.
530 Not logged in, use real E-mail address as password.
530 Not logged in.
530 Not logged in.
530 Not logged in.
530 Only client IP address allowed for PORT command.
530 Only client IP address allowed to connect to PASV socket.
530 password expired-please change password before proceeding.
530 Port number has to be between 1024 and 65535.
530 Sorry, no ANONYMOUS access allowed.
531 SSL/TLS lib refuses to initiate secure command connection.
533 SSL command connection required prior to CCC command.
534 Invalid option. Secure data connection required for implicit SFTP.
534 Invalid option. Secure data connection required for implicit SFTP.
550% s: Cannot create file.
550% s: Cannot delete directory.
550% s: Cannot delete file.
550% s: Cannot determine date/time.
550% s: Failed to create.
550% s: No such file or directory.
550% s: No such file or directory.
550% s: No such file or directory.
550% s: No such file or directory.
550% s: No such file or directory.
550% s: No such file or directory.
550% s: No such file or directory.
550% s: No such file or directory.
550% s: No such file.
550% s: No such file.
550% s: Permission denied.
550% s: Permission denied.
550% s: Permission denied.
550 Cannot change path to a port.
550 Cannot create a port.
550 Cannot create INDEX for ports.
550 Cannot create unique file name.
550 Cannot delete a port.
550 Cannot delete account home directory.
550 Cannot determine date/time for a port.
550 Cannot determine size of a port.
550 Cannot EXEC a port.
550 Cannot list port.
550 Cannot position file at requested starting point.
550 Cannot read requested number of bytes from file.
550 Cannot remove a port.
550 Cannot rename to a port.
550 Cannot RESTart at any position while APPEnding to a file.
550 Cannot RESTart beyond end-of-file.
550 Cannot RESTart in a (new) unique zero-length file.
550 Cannot RESTart in a new (zero-length) file.
550 File date/time cannot be set to future.
550 File transfer not allowed, server stop is pending.
550 File transfers not allowed, server stop is pending.
550 MDTM cannot change date/time on this server.
550 No files found.
550 No maintenance manager client.
550 Passive mode not allowed on this server.
550 Permission denied
550 Permission denied.
550 Permission denied.
550 Permission denied.
550 Permission denied.
550 Permission denied.
550 Permission denied.
550 Permission denied.
550 Permission denied.
550 Permission denied.
550 Permission denied.
550 Sorry, insufficient credit for download-upload first.
550 Sorry, maximum number of GETs reached for this session.
550 Sorry, maximum number of PUTs reached for this session.
553% s: Cannot change attributes.
553% s: Cannot change date/time.
553% s: Unable to rename file or directory.
553 Server Edition does not support remote administration.

Sometimes ftp uploads and downloads always encounter connection errors. The following causes are provided for your reference only:

Detailed description of Serv-u bbsftp prompts
1. 550 Not enouth credit to download. (bbsftp v2.6CE)

This prompt appears when you download an object. This prompt indicates that your current download traffic is insufficient.

2. 530 Not logged in. (bbsftp v2.6CE) [FTP <202.15.29.29: 21> User <rick> DB-FtpUserDown]

This prompt usually appears when logon fails. This prompt indicates that rick does not exist in FTP 202.15.29.29: 21.

3. 530 Not logged in, unauthorized IP address. (bbsftp v2.6CE)

Indicates that the IP address is unauthorized. The packet traffic user or packet time user can log on after modifying the permitted IP address range.

To log on to a public account, you must first make a purchase. Otherwise, this prompt will be displayed to prevent the public account from being stolen.

4. 530 Not logged in. (bbsftp v2.6CE) [BadPassword] [3]

The prompt message is clear and the password is incorrect.

5. 530 Not logged in. (bbsftp v2.6CE) [UserDBError-FTP_USERS]

This prompt is usually because the parameter settings are incorrect. If you have not customized the database view FTP_USERS, set whether to use the data view to not use it in the settings.

6. 530 Not logged in. (bbsftp v2.6CE) [UserDBError-FtpUserDown]

This error is generally caused by database problems, which may be caused by mysql Character Set settings. If it is a free version of bbsftp, it may also be caused by mysql optimization settings.

7. 421 Your Account Is Expired! (Bbsftp v2.6CE)

This prompt message appears during user logon. This indicates that the account has expired.

If you encounter this error when purchasing a traffic account, you can update your account information on the Forum (purchase an account on the purchase page ).

Purchase account at the time, so you need to purchase the account at the Forum.

The password of a public account is rarely displayed. If this prompt is displayed, it indicates that the public account has just finished updating the password, and the previous purchase records will be cleared, you must purchase a new public account and password to log on.

8. 421 Your Account Is Disabled! (Bbsftp v2.6CE)

This information appears during user logon, indicating that the account is disabled. Only the administrator can be contacted.

9. 530 Not logged in, home directory does not exist. (bbsftp v2.6CE)

It usually appears when a user logs on. It means that the root directory of the user does not exist.

Check the user carefully to see if the role has been configured. If the role does not exist, it is obviously a problem.

Then, check the setting of the FTP root directory in the corresponding role to see whether the Path entered in this setting exists on the ftp server.

If the problem persists, pay attention to the following three points:

1. After modifying the role settings, restart servu to take effect.

2. if the path is on an ntfs disk, ensure that the ftp server has the permission to access the path.

3. If the local directory security parameter is set, the path must be within the path range set in the security directory.

10. 550 Permission denied

Generally, the permission settings of the path access rule are incorrect,

First, check the role name of the user,

Then, check the role settings to see if the path access rule group number is set.

Then, check the path of the corresponding group number to access the rule group,

Check whether the FTP root directory access permission is added.

Sometimes Chinese characters are incorrect due to database reasons. Try using the English path name.

Note that you need to restart servu to modify these settings.