i just try to upload a file on FTP server , on the process while executing AT_QFTPOPEN command it shows +QFTPOPEN: 604,0 . From the document i have understood that it was a dns parse failed error.
so what should I do next?
AT+QIDNSGIP //get the IP address using the domain name
I found out the error, its an issue faced by wrong domain name . thank you for the response.