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I am getting error 550 “The token supplied to the function is invalid” when uploading to MS FTPS secure server. How can I fix it?

April 26, 2017Error ftps function invalid MS supplied token

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I am getting error 550 “The token supplied to the function is invalid” when uploading to MS FTPS secure server. How can I fix it?

1 Answer

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Use only Explicit mode of FTP transfer, not implicit mode. Implicit mode does not seem to work with Microsoft IIS FTP server.