I believe the settings are saved, but do not show back up when you enter the configuration webpage. When setting up mine, I had to enter the information every time while getting my settings correct. I set mine up with a static IP. The IP settings can be a little tricky if you aren’t familiar with those settings. One our IT guys helped me with mine. Also try setting up a user for your MQTT gateway just to see if it will work. I wrote a tutorial on setting up a MQTT gateway with Ignition SCADA, but it has a lot of generic info that could help you.