I am on the forum for the same issue; OS2.3 with 2.1.7 FW. The NIC shows a link light and activity, but I cannot access the web portal. The unit does continue to function, and the zones water. I’m trying a firmware upgrade to 2.1.9. It can take hours or weeks to hang. I’ll update when the problem reoccurs with 2.1.9 or when I’m confident the problem is resolved.
When this happens, how do you fix it? Restarting is not enough for me. I wind up playing with the ethernet cable, trying different ports on my switch, etc. I know this sounds like a network problem, but this is the only device I am having ANY issues with.
I have to unplug power, wait 10 seconds and plug back in. When it boots back up it all works. I tried wiggling network cable, unplugging/plugging back in and it did not help. Only a power cycle worked. I upgraded to 2.1.9 a few days back. So far no issues, but sometimes it took a month or more. It could be a while before I know for sure the FW upgrade worked.