1. Confirm that the network provides 2.4 GHz 802.11 b/g/n service. SB1000 does not connect to a 5 GHz-only network.
2. Test the unit outside the metal panel, or with the access point temporarily closer to the installation.
3. Check the SSID, password, DHCP, gateway, and DNS settings.
4. If both Ethernet and Wi-Fi are available, use Ethernet to determine whether the issue is limited to the radio connection.

Metal enclosures can attenuate the built-in radio enough to make Wi-Fi unreliable. In that situation, use Ethernet or change the access-point or enclosure arrangement.

Capacity note: enabling Wi-Fi consumes device memory and can reduce the practical point capacity by approximately 300 points. This does not normally explain a failure to join the network, but it is relevant on heavily configured units.