WARNING: ftp_nb_fput(): Server cannot accept argument.

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  • Hi, this error is not produced by PHP. It’s actually produced by the FTP server you want to transfer the backup.

    Looking at your log I think you use IIS in that FTP server. And this error is actually 501 HTTP error in IIS I think and it is related to FTP protocol. So a general diagnostic for this kinda problem would be capturing conversations between the client and the server by using Network Monitor or Wireshark. Then based on that you will find what is causing the problem.

    Thanks.

    • This reply was modified 7 years, 11 months ago by Rnaby.
    • This reply was modified 7 years, 11 months ago by Rnaby.
    Thread Starter Tech4Eleven

    (@tech4eleven)

    Makes sense. I’m just not sure what to change. My FTP server runs in IIS on a Windows 10 Pro machine.

    Here is the FTP server log for a backup I just did this morning: https://www.dropbox.com/s/fnii038523yghfi/u_ex170321-A.txt?dl=0

    Here is the log from backwpup for this same job. It produced this error above and more:
    https://www.dropbox.com/s/r1l2itgwhign9hp/u_ex170321-B.txt?dl=0

    (I’ve changed the sensitive information in each log)

    Thanks for looking.

    Thread Starter Tech4Eleven

    (@tech4eleven)

    I spent a gazillion hours troubleshooting this with my home spun FTP server and finally gave up and switched to Amazon S3 with BackWPUp which is the best thing i could have ever done for my sanity and backup solution.

    thanks for the help.

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