This issue is caused by the Tunnelblick DNS configuration. Please follow the steps below to resolve it:

  1. Click on the Tunnelblick icon in the taskbar and choose VPN Details.
  2. On the Details window, click on Settings. Click on the Set DNS/WINS option and select Set nameserver and re-connect.
  3. If that does not work, set it to nameserver (3.0b10) and re-connect.