I figured this out. The SFTP server has a throttle limit of three. Throttling is a standard security practice to prevent brute force attacks so I'm not sure why QB engineered their SFTP connection this way. It's almost like it's only meant to handle the single file use case and never expect multiple files.
As for the odd behavior in the QB connection credentials, I figured this out too. When the QB connection was rejected by the SFTP server's throttle limit - the browser page refreshes but it is parsing the SFTP URL return string incorrectly.
It puts the contents of the password into the username field and the password becomes blank. This invalidated the credentials making no further connections possible.
Valid bug that should be put on the bug fix list.
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Samantha Sand
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