Just updated my UniFi controller app to version 7.3.76 and noticed the following line now appears frequently in my log file:
UniFi Controller Login Connection Error: HTTPSConnectionPool(host='localhost', port=8443): Read timed out. (read timeout=5.0)
Oddly, the controller device in Indigo still shows Login OK and all systems appear normal. Just can't get the log entry to go away...not a big deal obviously but something isn't right. I've tried playing with a few things (trying the IP address rather than localhost (no difference) and checking the SSL box in the configure settings (which causes the connection to NOT work)). I have self-signed mkcert created certificate to deal with UniFi's SSL browser login issues...not sure if that's related to this issue or not.