I have a FTP server (IIS) that only allows for certain file types to be uploaded (for example only images). I achieve this with the File Screening feature in the File Server Resource Manager.
This works fine so far, however now I need to only allow standard letters and numbers in filename.
Examples:
test.jpg [valid]
Test 1.png [valid]
tëßt.png [invalid]
The File Screening feature doesn't work here.
- There are way too many characters that I don't want to allow (so Included Files is no option).
- I can't add every character I allow to the Excluded Files since then the extension check no longer works (it will be valid whenever the filename is valid or when the extension matches).
Is there another way I could achieve this?