3CX Phone for Windows could not establish a connection to the 3CX Phone System Web API

[abhishek272]

3CX Phone for Windows could not establish a connection to the 3CX Phone System Web API. As a result, features like Contacts and presence information will not be available. You can still make and receive Phone Calls via SIP whilst we try and re-establish full functionality in the background."

 

[craigreilly]

local pbx or cloud or remote office?

 

[YiannisH_3CX]

That message suggests that the 3CX client does not get presence from the PBX. The presence goes through the https port specified during the installation (default is 5001). Make sure that the port is open. Also disable any antivirus and windows firewall on the PBX machine and the client machine to see if that helps