Blocking TFTP write requests

[Mohamedhh96]

Now I have TFTP server behind my FortiGate firewall I want to allow on read requests for TFTP for and reject write requests. how can I do that using firewall policy?

[AEK]

The normal way to do is to deny writes at server level, not at firewall level.

But if you really need to do it at firewall level then I guess you will need to write a custom signature and block traffic matching that signature.