I am having difficulty setting up some new X50s. I bought the to replace a very old and failing mesh system. As I recall, I plugged in the old system, followed the instructions and it just worked. With the X50s that is not the case. My best guess is something is going wrong with DHCP. I run my own DHCP server, which has had no problems for years, but could have some minore misconfiguration.

When I have tried putting a single X50 into Access Point mode, it all works OK, except for all Android devices, which fail to obtain an IP addess. I have to assign them a static IP and then they work fine.

I have also tried in Router mode. In this case connecting is fine, even with my Android phone, but the X50 cannot make an outbound connection. Connecting to its web interface, I see the WAN port has no IP address. I connected my laptop and ran up wireshark and found the X50 is initiating a DHCP conversation with my server. I see Discover -> Offer -> Request -> ACK. This looks good, as the packets include the allocated IP, DNS servers, gateways etc. Unfortunately, this conversation repeats.

Any guesses what is wrong? Where else can I look for clues?