FTPS implicit TLS/SSL error -

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i using ftp on implicit ssl upload files. encountered following error message

[command]  pwd [response]  257 "/" current directory. [command]  pwd [response]  257 "/" current directory. [command]  type [response]  200 type set [command]  pwd [response]  257 "/" current directory. [command]  pasv [response]  227 entering passive mode (10,0,0,19,195,113) [command]  list -al [response]  521 prot p required [command]  pwd [response]  257 "/" current directory. [command]  pasv [response]  227 entering passive mode (10,0,0,19,195,114) [command]  list -al [response]  521 prot p required [status] failed::ftp protocol error. 521 prot p required.

may know error message "521 prot p required" saying?

thanks

before starting data transfer (e.g. creating new data connection outside control connection transfer files or listing) have specify protection level using prot command. main protection levels p protected (e.g. ssl encryption) or c clear (no encryption). server complains, because don't specify protection level , not know how want data.

the prot command must implemented , used ftps clients.


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