I only ran into this issue once on Website Panel which did not get resolved and i ended up deleting the entire environment and re-installing the servers from scratch again.

Well for this one it comes down to settings.

First:

Do you see the user dir + username auth been created in IIS Management? (see screenshot)

and to check auth:

next up is the FTP Default permissions:

the isolation mode:

[SOLVED]

Hi Marco,

I just found the issue.

The FTP User Role that I created did not match the FTP User Group Name in the SolidCP Panel.  I corrected the name in SolidCP, i deleted the FTP accounts and re-created the accounts after the fix.  And now they all work.

Sorry to bother you on this.

I am usually very accurate to these settings, I guess I was just excited to try out SolidCP 🙂

Hopefully this will help others as well as this can be easily missed!