@kylemoo said in Connected via web control then next day can't connect?:

Does that happen a lot with Duet2wifi boards?

No more than any other WiFi device, in my experience.

If your Duet is set up to use DHCP, so gets its address from the router, connecting using the printer name with .local on the end means you don't need to keep track of the IP address if the router resets. However, using the printer name to connect will depend on your router and your PC supporting mDNS/DNS-SD (also known as zeroconf and Bonjour, longer article about this here), which is the network protocol used for this. Generally, routers less than 5 years old should support it. For your PC, see this article, but basically Apple Macs (and, I think, Windows 10) support it, while Linux and Windows (other versions) need to have it installed.

Alternatively, set your Duet to a fixed IP address, using M587 to update the stored WiFi access point information (run this from the console), eg:
M587 S"your_wifi_network_SSID" P"your_wifi_password" I"192.168.0.114"
Then the IP address you connect to will always be the same.

Ian