Thanks for posting the diagnostic info.
When you click "Connect", Tunnelblick first makes a request for https://tunnelblick.net/ipinfo
. That should result in a short response from tunnelblick.net
with the IP address and port of your computer, and the IP address of tunnelblick.net
. While that request is being processed, Tunnelblick starts connecting the VPN. If a response to the request is not received by the time the VPN is connected, you get the error message you describe.
In other words, it means that a response to that request is not being received. That can happen for various reasons (network congestion, blocking by firewalls, etc.) Sometimes it is temporary, sometimes it isn't.
This is used by Tunnelblick when testing if your computer's IP address changed after connecting to the VPN. (It repeats the "ipinfo" request after connecting the VPN and compares the results.)
Try the following, without being connected to the VPN: use Safari or another browser to go to https://tunnelblick.net/ipinfo
. It should respond fairly quickly with something like
where aaa.bbb.ccc is your public IP address, nnnn is an apparently random number less than 65536 (it's the port from which your computer or router made the request), and 18.104.22.168 is the IP address of tunnelblicnk.net
If you don't get a response, either the server is down (it wasn't when I tried it a minute ago, and it is usually very reliably up), or a firewall is blocking access to tunnelblick.net
. Since you don't appear to be in China or somewhere else that active blocking is going on, I have no good explanation for that.
If the VPN is working, you can check the "Do not warn me about this again" if it appears in the window. If not, you can disable IP address checking by un-checking the "Check if the apparent public IP address changed after connecting" checkbox in the 'Advanced" window. Be sure to select the configuration(s) that you want the check to apply to in the list on the left side of the "VPN Details…" window before clicking "Advanced" button to get to the checkbox.