When setting up the communications protocols, one must differentiate between the protocol that is used solely for checking the device and for other operations such as a firmware upload, etc.:
LANconfig: Tools / Options / Communication
- HTTPS, HTTP, TFPT When this is selected, the individual protocols are enabled for the operations firmware upload, configuration up/download, and script up/download. In these operations, LANconfig attempts to use these protocols in the order HTTPS, HTTP and TFTP. If the transfer fails when using a selected protocol, then the next protocol is automatically attempted.
- Prefer checks via TFTP
When checking the devices, only small amounts of data are transferred
with the system information. As such, device checks could be performed
using the TFTP protocol, particularly in the LAN. When this option is
activated, the TFTP protocol is used to check the device first, regardless
of the previously set communications protocols. If the check via TFTP
fails, then the protocols HTTPS and HTTP are attempted in that order.
Note: The device-specific settings are subordinate to the global communications settings. This allows, for example, the use of a protocol to be restricted centrally.