upgraded from 2024.12.5 to 2025.1 and my ecowitt integration stopped working
Can you give us more details? I haven’t upgraded yet! 
I have the same issue, netstat -tna does not show port 4199 as listening
Reverted to 2025.12.5 and port 4199 is again listening and all is back working.
The Custom Integration that can be loaded thru HACS loader has a problem with a missing constant. It needs to be reported to and fixed by the Custom Integration Author(s) in GitHub.
The Core Ecowitt integration is working fine and I have seen no interruption.
As a matter of fact I added 2 temperature sensors to my Ecowitt network today, no problems.
There seems to be some weird crossover between the custom integration and the core one. Several times I have tried to migrate to core but ended up with the same thing - presumably I’m not deleting something properly.